diff --git a/collects/compiler/decompile.rkt b/collects/compiler/decompile.rkt
index ca9b60c7a5..903e6843ef 100644
--- a/collects/compiler/decompile.rkt
+++ b/collects/compiler/decompile.rkt
@@ -186,7 +186,7 @@
     [(struct def-values (ids rhs))
      `(define-values ,(map (lambda (tl)
                              (match tl
-                               [(struct toplevel (depth pos const? mutated?))
+                               [(struct toplevel (depth pos const? set-const?))
                                 (list-ref/protect (glob-desc-vars globs) pos 'def-vals)]))
                            ids)
         ,(decompile-expr rhs globs stack closed))]
@@ -250,10 +250,14 @@
   (match expr
     [(struct toplevel (depth pos const? ready?))
      (let ([id (list-ref/protect (glob-desc-vars globs) pos 'toplevel)])
-       (if (or no-check? const? ready?)
-           id
-           `(#%checked ,id)))]))
-             
+       (cond
+        [no-check? id]
+        [(and (not const?) (not ready?))
+         `(#%checked ,id)]
+        #;[(and const? ready?) `(#%const ,id)]
+        #;[const? `(#%iconst ,id)]
+        [else id]))]))
+
 (define (decompile-expr expr globs stack closed)
   (match expr
     [(struct toplevel (depth pos const? ready?))
diff --git a/collects/compiler/zo-marshal.rkt b/collects/compiler/zo-marshal.rkt
index 124b01c48c..e435a97080 100644
--- a/collects/compiler/zo-marshal.rkt
+++ b/collects/compiler/zo-marshal.rkt
@@ -554,8 +554,8 @@
                         (if (or const? ready?)
                             (cons pos
                                   (bitwise-ior 
-                                   (if const? #x1 0)
-                                   (if ready? #x2 0)))
+                                   (if const? #x2 0)
+                                   (if ready? #x1 0)))
                             pos))
                        out)]
        [(struct topsyntax (depth pos midpt))
diff --git a/collects/compiler/zo-parse.rkt b/collects/compiler/zo-parse.rkt
index d1aaf68478..3c559ec62b 100644
--- a/collects/compiler/zo-parse.rkt
+++ b/collects/compiler/zo-parse.rkt
@@ -33,10 +33,13 @@
 ;; Bytecode unmarshalers for various forms
 
 (define (read-toplevel v)
-  (define SCHEME_TOPLEVEL_CONST #x01)
-  (define SCHEME_TOPLEVEL_READY #x02)
+  (define SCHEME_TOPLEVEL_CONST #x02)
+  (define SCHEME_TOPLEVEL_READY #x01)
   (match v
     [(cons depth (cons pos flags))
+     ;; In the VM, the two flag bits are actually interpreted
+     ;; as a number when the toplevel is a reference, but we
+     ;; interpret the bits as flags here for backward compatibility.
      (make-toplevel depth pos 
                     (positive? (bitwise-and flags SCHEME_TOPLEVEL_CONST))
                     (positive? (bitwise-and flags SCHEME_TOPLEVEL_READY)))]
diff --git a/collects/scribblings/raco/zo-struct.scrbl b/collects/scribblings/raco/zo-struct.scrbl
index 23236a9a02..1840367273 100644
--- a/collects/scribblings/raco/zo-struct.scrbl
+++ b/collects/scribblings/raco/zo-struct.scrbl
@@ -375,12 +375,21 @@ structures that are produced by @racket[zo-parse] and consumed by
   of stack slots to skip to reach the prefix array, and @racket[pos] is
   the offset into the array.
 
-  If @racket[const?] is @racket[#t], then the variable definitely will
-  be defined, and its value stays constant. If @racket[ready?] is
-  @racket[#t], then the variable definitely will be defined (but its
-  value might change in the future). If @racket[const?] and
-  @racket[ready?] are both @racket[#f], then a check is needed to
-  determine whether the variable is defined.}
+  When the @racket[toplevel] is an expression, if both @racket[const?]
+  and @racket[ready?] are @racket[#t], then the variable definitely
+  will be defined, its value stays constant, and the constant is
+  effectively the same for every module instantiation. If only
+  @racket[const?] is @racket[#t], then the value is constant, but it
+  may vary across instantiations. If only @racket[ready?] is
+  @racket[#t], then the variable definitely will be defined, but its
+  value may change. If @racket[const?] and @racket[ready?] are both
+  @racket[#f], then a check is needed to determine whether the
+  variable is defined.
+
+  When the @racket[toplevel] is the right-hand side for
+  @racket[def-values], then @racket[const?]  is @racket[#f]. If
+  @racket[ready?] is @racket[#t], the variable is marked as immutable
+  after it is defined.}
 
 @defstruct+[(topsyntax expr)
             ([depth exact-nonnegative-integer?]
diff --git a/src/racket/src/compenv.c b/src/racket/src/compenv.c
index d5a12b9fc7..8ca9d63e17 100644
--- a/src/racket/src/compenv.c
+++ b/src/racket/src/compenv.c
@@ -624,10 +624,11 @@ Scheme_Object *scheme_register_toplevel_in_prefix(Scheme_Object *var, Scheme_Com
 
   o = scheme_make_toplevel(0, cp->num_toplevels, 0, 
                            (imported 
-                            ? (SCHEME_TOPLEVEL_READY 
-                               | ((SCHEME_MODVAR_FLAGS(var) & 0x1)
-                                  ? SCHEME_TOPLEVEL_CONST
-                                  : 0))
+                            ? ((SCHEME_MODVAR_FLAGS(var) & SCHEME_MODVAR_CONST)
+                               ? SCHEME_TOPLEVEL_CONST
+                               : ((SCHEME_MODVAR_FLAGS(var) & SCHEME_MODVAR_FIXED)
+                                  ? SCHEME_TOPLEVEL_FIXED
+                                  : SCHEME_TOPLEVEL_READY))
                             : 0));
 
   cp->num_toplevels++;
@@ -884,6 +885,7 @@ static Scheme_Local *get_frame_loc(Scheme_Comp_Env *frame,
 Scheme_Object *scheme_hash_module_variable(Scheme_Env *env, Scheme_Object *modidx, 
 					   Scheme_Object *stxsym, Scheme_Object *insp,
 					   int pos, intptr_t mod_phase, int is_constant)
+/* is_constant == 2 => constant over all instantiations and phases */
 {
   Scheme_Object *val;
   Scheme_Hash_Table *ht;
@@ -919,8 +921,10 @@ Scheme_Object *scheme_hash_module_variable(Scheme_Env *env, Scheme_Object *modid
       mv->pos = pos;
       mv->mod_phase = (int)mod_phase;
 
-      if (is_constant)
-        SCHEME_MODVAR_FLAGS(mv) |= 0x1;
+      if (is_constant > 1)
+        SCHEME_MODVAR_FLAGS(mv) |= SCHEME_MODVAR_CONST;
+      else if (is_constant)
+        SCHEME_MODVAR_FLAGS(mv) |= SCHEME_MODVAR_FIXED;
       
       val = (Scheme_Object *)mv;
       
@@ -1636,7 +1640,7 @@ scheme_lookup_binding(Scheme_Object *find_id, Scheme_Comp_Env *env, int flags,
                       Scheme_Object **_lexical_binding_id)
 {
   Scheme_Comp_Env *frame;
-  int j = 0, p = 0, modpos, skip_stops = 0, module_self_reference = 0;
+  int j = 0, p = 0, modpos, skip_stops = 0, module_self_reference = 0, is_constant;
   Scheme_Bucket *b;
   Scheme_Object *val, *modidx, *modname, *src_find_id, *find_global_id, *mod_defn_phase;
   Scheme_Object *find_id_sym = NULL, *rename_insp = NULL, *mod_constant = NULL;
@@ -1932,10 +1936,18 @@ scheme_lookup_binding(Scheme_Object *find_id, Scheme_Comp_Env *env, int flags,
 
   check_taint(src_find_id);
 
-  if ((flags & SCHEME_ELIM_CONST) 
-      && mod_constant 
-      && !SAME_OBJ(mod_constant, scheme_void_proc))
-    return mod_constant;
+  if (mod_constant) {
+    if (SAME_OBJ(mod_constant, scheme_constant_key))
+      is_constant = 2;
+    else if (SAME_OBJ(mod_constant, scheme_fixed_key))
+      is_constant = 1;
+    else {
+      if (flags & SCHEME_ELIM_CONST) 
+        return mod_constant;
+      is_constant = 2;
+    }
+  } else
+    is_constant = 0;
 
   /* Used to have `&& !SAME_OBJ(modidx, modname)' below, but that was a bad
      idea, because it causes module instances to be preserved. */
@@ -1949,7 +1961,7 @@ scheme_lookup_binding(Scheme_Object *find_id, Scheme_Comp_Env *env, int flags,
     return scheme_hash_module_variable(env->genv, modidx, find_id, 
 				       (rename_insp ? rename_insp : genv->module->insp),
 				       modpos, SCHEME_INT_VAL(mod_defn_phase),
-                                       !!mod_constant);
+                                       is_constant);
   }
 
   if (!modname 
@@ -1960,7 +1972,7 @@ scheme_lookup_binding(Scheme_Object *find_id, Scheme_Comp_Env *env, int flags,
     return scheme_hash_module_variable(env->genv, genv->module->self_modidx, find_global_id, 
 				       genv->module->insp,
 				       modpos, genv->mod_phase,
-                                       !!mod_constant);
+                                       is_constant);
   }
 
   b = scheme_bucket_from_table(genv->toplevel, (char *)find_global_id);
diff --git a/src/racket/src/cstartup.inc b/src/racket/src/cstartup.inc
index 8fd155c375..3fce116853 100644
--- a/src/racket/src/cstartup.inc
+++ b/src/racket/src/cstartup.inc
@@ -1,5 +1,5 @@
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,50,46,52,0,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,51,46,50,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,51,0,0,0,1,0,0,10,0,13,0,22,
 0,26,0,31,0,38,0,51,0,58,0,63,0,68,0,72,0,79,0,82,0,
 85,0,91,0,105,0,119,0,122,0,128,0,132,0,134,0,145,0,147,0,161,
@@ -15,13 +15,13 @@
 116,120,61,115,70,108,101,116,45,118,97,108,117,101,115,61,120,73,108,101,116,
 114,101,99,45,118,97,108,117,101,115,66,108,97,109,98,100,97,1,20,112,97,
 114,97,109,101,116,101,114,105,122,97,116,105,111,110,45,107,101,121,61,118,73,
-100,101,102,105,110,101,45,118,97,108,117,101,115,97,36,11,8,240,124,75,0,
+100,101,102,105,110,101,45,118,97,108,117,101,115,97,36,11,8,240,72,76,0,
 0,95,159,2,17,36,36,159,2,16,36,36,159,2,16,36,36,16,20,2,4,
 2,2,2,6,2,2,2,7,2,2,2,8,2,2,2,9,2,2,2,10,2,
 2,2,11,2,2,2,5,2,2,2,12,2,2,2,13,2,2,97,37,11,8,
-240,124,75,0,0,93,159,2,16,36,37,16,2,2,3,161,2,2,37,2,3,
-2,2,2,3,96,38,11,8,240,124,75,0,0,16,0,96,11,11,8,240,124,
-75,0,0,16,0,18,98,64,104,101,114,101,13,16,5,36,2,14,2,2,11,
+240,72,76,0,0,93,159,2,16,36,37,16,2,2,3,161,2,2,37,2,3,
+2,2,2,3,96,38,11,8,240,72,76,0,0,16,0,96,11,11,8,240,72,
+76,0,0,16,0,18,98,64,104,101,114,101,13,16,5,36,2,14,2,2,11,
 11,8,32,8,31,8,30,8,29,27,248,22,155,4,195,249,22,148,4,80,158,
 39,36,251,22,83,2,18,248,22,98,199,12,249,22,73,2,19,248,22,100,201,
 27,248,22,155,4,195,249,22,148,4,80,158,39,36,251,22,83,2,18,248,22,
@@ -30,14 +30,14 @@
 74,193,249,22,148,4,80,158,39,36,251,22,83,2,18,248,22,74,199,249,22,
 73,2,11,248,22,75,201,11,18,100,10,13,16,5,36,2,14,2,2,11,11,
 8,32,8,31,8,30,8,29,16,4,11,11,2,20,3,1,8,101,110,118,49,
-52,53,53,50,16,4,11,11,2,21,3,1,8,101,110,118,49,52,53,53,51,
+52,55,51,57,16,4,11,11,2,21,3,1,8,101,110,118,49,52,55,52,48,
 27,248,22,75,248,22,155,4,196,28,248,22,81,193,20,14,159,37,36,37,28,
 248,22,81,248,22,75,194,248,22,74,193,249,22,148,4,80,158,39,36,250,22,
 83,2,22,248,22,83,249,22,83,248,22,83,2,23,248,22,74,201,251,22,83,
 2,18,2,23,2,23,249,22,73,2,13,248,22,75,204,18,100,11,13,16,5,
 36,2,14,2,2,11,11,8,32,8,31,8,30,8,29,16,4,11,11,2,20,
-3,1,8,101,110,118,49,52,53,53,53,16,4,11,11,2,21,3,1,8,101,
-110,118,49,52,53,53,54,248,22,155,4,193,27,248,22,155,4,194,249,22,73,
+3,1,8,101,110,118,49,52,55,52,50,16,4,11,11,2,21,3,1,8,101,
+110,118,49,52,55,52,51,248,22,155,4,193,27,248,22,155,4,194,249,22,73,
 248,22,83,248,22,74,196,248,22,75,195,27,248,22,75,248,22,155,4,23,197,
 1,249,22,148,4,80,158,39,36,28,248,22,58,248,22,149,4,248,22,74,23,
 198,2,27,249,22,2,32,0,88,163,8,36,37,43,11,9,222,33,40,248,22,
@@ -67,8 +67,8 @@
 140,9,248,22,149,4,248,22,74,200,64,101,108,115,101,10,248,22,74,197,250,
 22,84,2,22,9,248,22,75,200,249,22,73,2,5,248,22,75,202,99,13,16,
 5,36,2,14,2,2,11,11,8,32,8,31,8,30,8,29,16,4,11,11,2,
-20,3,1,8,101,110,118,49,52,53,55,56,16,4,11,11,2,21,3,1,8,
-101,110,118,49,52,53,55,57,18,158,94,10,64,118,111,105,100,8,48,27,248,
+20,3,1,8,101,110,118,49,52,55,54,53,16,4,11,11,2,21,3,1,8,
+101,110,118,49,52,55,54,54,18,158,94,10,64,118,111,105,100,8,48,27,248,
 22,75,248,22,155,4,196,249,22,148,4,80,158,39,36,28,248,22,58,248,22,
 149,4,248,22,74,197,250,22,83,2,28,248,22,83,248,22,74,199,248,22,98,
 198,27,248,22,149,4,248,22,74,197,250,22,83,2,28,248,22,83,248,22,74,
@@ -98,16 +98,16 @@
     EVAL_ONE_SIZED_STR((char *)expr, 2004);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,50,46,52,0,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,51,46,50,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,82,0,0,0,1,0,0,8,0,21,0,26,
 0,43,0,58,0,76,0,92,0,106,0,128,0,146,0,166,0,182,0,200,0,
 231,0,4,1,26,1,40,1,46,1,60,1,65,1,75,1,83,1,111,1,143,
 1,188,1,194,1,201,1,207,1,252,1,20,2,59,2,73,2,76,2,79,2,
 89,2,100,2,113,2,115,2,117,2,27,3,117,4,231,4,89,5,130,5,203,
 6,33,7,119,7,219,7,47,8,61,8,194,8,168,9,252,9,10,10,31,11,
-235,11,249,11,141,16,156,17,45,18,30,19,12,20,19,20,98,20,179,20,6,
-21,21,21,31,21,164,25,161,30,184,30,201,30,149,32,252,32,10,33,170,33,
-107,35,116,35,125,35,151,35,23,36,0,0,131,39,0,0,67,35,37,117,116,
+235,11,249,11,141,16,156,17,45,18,30,19,12,20,19,20,98,20,179,20,122,
+21,136,21,146,21,187,22,33,23,56,23,73,23,21,25,124,25,138,25,42,26,
+235,27,244,27,253,27,23,28,151,28,0,0,2,32,0,0,67,35,37,117,116,
 105,108,115,72,112,97,116,104,45,115,116,114,105,110,103,63,64,98,115,98,115,
 76,110,111,114,109,97,108,45,99,97,115,101,45,112,97,116,104,74,45,99,104,
 101,99,107,45,114,101,108,112,97,116,104,77,45,99,104,101,99,107,45,99,111,
@@ -138,14 +138,14 @@
 11,11,80,76,84,67,79,76,76,69,67,84,83,6,0,0,6,0,0,69,97,
 100,100,111,110,45,100,105,114,6,8,8,99,111,108,108,101,99,116,115,72,99,
 111,108,108,101,99,116,115,45,100,105,114,5,0,5,0,27,20,13,159,80,159,
-37,52,38,250,80,159,40,53,38,249,22,27,11,80,159,42,52,38,22,186,13,
+37,52,37,250,80,159,40,53,37,249,22,27,11,80,159,42,52,37,22,186,13,
 10,248,22,190,5,23,196,2,28,248,22,189,6,23,194,2,12,86,94,248,22,
-148,9,23,194,1,27,20,13,159,80,159,38,52,38,250,80,159,41,53,38,249,
-22,27,11,80,159,43,52,38,22,186,13,10,248,22,190,5,23,197,2,28,248,
+148,9,23,194,1,27,20,13,159,80,159,38,52,37,250,80,159,41,53,37,249,
+22,27,11,80,159,43,52,37,22,186,13,10,248,22,190,5,23,197,2,28,248,
 22,189,6,23,194,2,12,86,94,248,22,148,9,23,194,1,27,20,13,159,80,
-159,39,52,38,250,80,159,42,53,38,249,22,27,11,80,159,44,52,38,22,186,
+159,39,52,37,250,80,159,42,53,37,249,22,27,11,80,159,44,52,37,22,186,
 13,10,248,22,190,5,23,198,2,28,248,22,189,6,23,194,2,12,86,94,248,
-22,148,9,23,194,1,248,80,159,40,57,37,197,28,248,22,81,23,195,2,9,
+22,148,9,23,194,1,248,80,159,40,57,39,197,28,248,22,81,23,195,2,9,
 27,248,22,74,23,196,2,27,28,248,22,172,14,23,195,2,23,194,1,28,248,
 22,171,14,23,195,2,249,22,173,14,23,196,1,250,80,158,43,50,248,22,188,
 14,2,21,11,10,250,80,158,41,50,248,22,188,14,2,21,23,197,1,10,28,
@@ -154,25 +154,25 @@
 2,27,28,248,22,172,14,23,195,2,23,194,1,28,248,22,171,14,23,195,2,
 249,22,173,14,23,196,1,250,80,158,48,50,248,22,188,14,2,21,11,10,250,
 80,158,46,50,248,22,188,14,2,21,23,197,1,10,28,23,193,2,249,22,73,
-248,22,175,14,249,22,173,14,23,198,1,247,22,189,14,248,80,159,46,56,37,
-248,22,75,23,199,1,86,94,23,193,1,248,80,159,44,56,37,248,22,75,23,
+248,22,175,14,249,22,173,14,23,198,1,247,22,189,14,248,80,159,46,56,39,
+248,22,75,23,199,1,86,94,23,193,1,248,80,159,44,56,39,248,22,75,23,
 197,1,86,94,23,193,1,27,248,22,75,23,198,1,28,248,22,81,23,194,2,
 9,27,248,22,74,23,195,2,27,28,248,22,172,14,23,195,2,23,194,1,28,
 248,22,171,14,23,195,2,249,22,173,14,23,196,1,250,80,158,46,50,248,22,
 188,14,2,21,11,10,250,80,158,44,50,248,22,188,14,2,21,23,197,1,10,
 28,23,193,2,249,22,73,248,22,175,14,249,22,173,14,23,198,1,247,22,189,
-14,248,80,159,44,56,37,248,22,75,23,199,1,248,80,159,42,56,37,248,22,
+14,248,80,159,44,56,39,248,22,75,23,199,1,248,80,159,42,56,39,248,22,
 75,196,28,248,22,81,23,195,2,9,27,248,22,74,23,196,2,27,28,248,22,
 172,14,23,195,2,23,194,1,28,248,22,171,14,23,195,2,249,22,173,14,23,
 196,1,250,80,158,43,50,248,22,188,14,2,21,11,10,250,80,158,41,50,248,
 22,188,14,2,21,23,197,1,10,28,23,193,2,249,22,73,248,22,175,14,249,
-22,173,14,23,198,1,247,22,189,14,248,80,159,41,55,37,248,22,75,23,200,
-1,248,80,159,39,55,37,248,22,75,197,28,248,22,81,23,195,2,9,27,248,
+22,173,14,23,198,1,247,22,189,14,248,80,159,41,55,39,248,22,75,23,200,
+1,248,80,159,39,55,39,248,22,75,197,28,248,22,81,23,195,2,9,27,248,
 22,74,23,196,2,27,28,248,22,172,14,23,195,2,23,194,1,28,248,22,171,
 14,23,195,2,249,22,173,14,23,196,1,250,80,158,43,50,248,22,188,14,2,
 21,11,10,250,80,158,41,50,248,22,188,14,2,21,23,197,1,10,28,23,193,
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@@ -355,245 +355,153 @@
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-45,115,116,120,11,9,9,9,36,0};
-    EVAL_ONE_SIZED_STR((char *)expr, 10320);
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+88,163,36,37,54,38,2,4,223,0,33,45,80,159,36,38,37,20,15,16,2,
+32,0,88,163,8,36,38,50,11,2,5,222,33,46,80,159,36,39,37,20,15,
+16,2,32,0,88,163,8,36,39,51,11,2,6,222,33,48,80,159,36,40,37,
+20,15,16,2,32,0,88,163,8,45,38,54,11,2,7,222,33,52,80,159,36,
+41,37,20,15,16,2,32,0,88,163,45,39,53,11,2,9,222,33,56,80,159,
+36,43,37,20,15,16,2,32,0,88,163,36,41,59,11,2,8,222,33,59,80,
+159,36,42,37,20,15,16,2,32,0,88,163,36,39,50,11,2,10,222,33,60,
+80,159,36,44,37,20,15,16,2,32,0,88,163,36,38,53,11,2,11,222,33,
+61,80,159,36,45,37,20,15,16,2,32,0,88,163,36,38,54,11,2,12,222,
+33,62,80,159,36,46,37,20,15,16,2,32,0,88,163,36,37,44,11,2,13,
+222,33,63,80,159,36,47,37,20,15,16,2,20,25,96,2,14,88,163,36,36,
+53,8,240,0,32,4,0,9,223,0,33,64,88,163,36,37,54,8,240,0,32,
+8,0,9,223,0,33,65,88,163,36,38,58,8,240,0,96,16,0,9,223,0,
+33,66,80,159,36,48,37,20,15,16,2,27,248,22,131,15,248,22,144,8,27,
+28,249,22,140,9,247,22,152,8,2,22,6,1,1,59,6,1,1,58,250,22,
+178,7,6,14,14,40,91,94,126,97,93,42,41,126,97,40,46,42,41,23,196,
+2,23,196,1,88,163,8,36,38,48,11,2,15,223,0,33,70,80,159,36,49,
+37,20,15,16,2,20,25,96,2,16,88,163,8,36,39,8,24,8,128,128,9,
+223,0,33,77,88,163,8,36,38,47,8,240,0,64,0,0,9,223,0,33,78,
+88,163,8,36,37,46,8,240,0,64,0,0,9,223,0,33,79,80,159,36,50,
+37,20,15,16,2,88,163,8,36,39,54,8,240,0,64,32,0,2,17,223,0,
+33,81,80,159,36,51,37,94,29,94,2,18,68,35,37,107,101,114,110,101,108,
+11,29,94,2,18,69,35,37,109,105,110,45,115,116,120,11,9,9,9,36,0};
+    EVAL_ONE_SIZED_STR((char *)expr, 8399);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,50,46,52,0,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,51,46,50,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,12,0,0,0,1,0,0,15,0,40,0,57,
 0,75,0,97,0,120,0,140,0,162,0,169,0,176,0,183,0,0,0,178,1,
 0,0,74,35,37,112,108,97,99,101,45,115,116,114,117,99,116,1,23,115,116,
@@ -620,15 +528,15 @@
     EVAL_ONE_SIZED_STR((char *)expr, 499);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,50,46,52,0,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,51,46,50,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,65,0,0,0,1,0,0,7,0,18,0,45,
 0,51,0,64,0,73,0,80,0,102,0,124,0,150,0,158,0,170,0,185,0,
 201,0,219,0,239,0,251,0,11,1,34,1,46,1,77,1,84,1,89,1,94,
 1,99,1,104,1,109,1,118,1,123,1,127,1,135,1,144,1,152,1,213,1,
 60,2,81,2,102,2,132,2,162,2,220,2,22,3,71,3,120,3,54,9,105,
-9,168,9,187,9,201,9,103,10,117,10,47,12,141,14,8,15,14,15,28,15,
-55,15,75,15,135,15,222,15,224,15,37,16,121,22,174,22,198,22,0,0,34,
-26,0,0,66,35,37,98,111,111,116,70,100,108,108,45,115,117,102,102,105,120,
+9,168,9,187,9,201,9,103,10,116,10,250,10,36,12,159,12,165,12,179,12,
+206,12,226,12,30,13,117,13,119,13,188,13,16,20,69,20,93,20,0,0,185,
+23,0,0,66,35,37,98,111,111,116,70,100,108,108,45,115,117,102,102,105,120,
 1,25,100,101,102,97,117,108,116,45,108,111,97,100,47,117,115,101,45,99,111,
 109,112,105,108,101,100,65,113,117,111,116,101,29,94,2,4,67,35,37,117,116,
 105,108,115,11,68,35,37,112,97,114,97,109,122,29,94,2,4,2,6,11,1,
@@ -647,30 +555,30 @@
 29,94,2,4,2,6,11,64,98,111,111,116,64,115,101,97,108,64,115,97,109,
 101,5,3,46,122,111,5,3,46,122,111,6,6,6,110,97,116,105,118,101,64,
 108,111,111,112,63,108,105,98,67,105,103,110,111,114,101,100,249,22,14,195,80,
-159,38,49,38,249,80,159,38,52,37,195,10,90,159,39,11,89,161,39,36,11,
+159,38,49,38,249,80,159,38,52,39,195,10,90,159,39,11,89,161,39,36,11,
 248,22,169,14,197,86,95,23,195,1,23,193,1,28,249,22,135,15,0,11,35,
 114,120,34,91,46,93,115,115,36,34,248,22,153,14,23,197,1,249,80,159,41,
-56,38,198,5,4,46,114,107,116,196,27,28,23,195,2,28,249,22,140,9,23,
+56,39,198,5,4,46,114,107,116,196,27,28,23,195,2,28,249,22,140,9,23,
 197,2,80,158,39,50,86,94,23,195,1,80,158,37,51,27,248,22,137,5,23,
 197,2,28,248,22,148,14,23,194,2,90,159,39,11,89,161,39,36,11,248,22,
 169,14,23,197,1,86,95,20,18,159,11,80,158,41,50,198,20,18,159,11,80,
 158,41,51,192,192,11,11,28,23,193,2,192,86,94,23,193,1,27,247,22,159,
 5,28,192,192,247,22,189,14,250,22,166,14,23,197,1,23,199,1,249,80,159,
-43,39,38,23,198,1,2,26,250,22,166,14,23,197,1,23,199,1,249,80,159,
-43,39,38,23,198,1,2,27,252,22,166,14,23,199,1,23,201,1,2,28,247,
-22,153,8,249,80,159,45,39,38,23,200,1,80,159,45,36,38,252,22,166,14,
-23,199,1,23,201,1,2,28,247,22,153,8,249,80,159,45,39,38,23,200,1,
+43,39,39,23,198,1,2,26,250,22,166,14,23,197,1,23,199,1,249,80,159,
+43,39,39,23,198,1,2,27,252,22,166,14,23,199,1,23,201,1,2,28,247,
+22,153,8,249,80,159,45,39,39,23,200,1,80,159,45,36,38,252,22,166,14,
+23,199,1,23,201,1,2,28,247,22,153,8,249,80,159,45,39,39,23,200,1,
 80,159,45,36,38,27,252,22,166,14,23,200,1,23,202,1,2,28,247,22,153,
-8,249,80,159,46,39,38,23,201,1,80,159,46,36,38,27,250,22,183,14,196,
+8,249,80,159,46,39,39,23,201,1,80,159,46,36,38,27,250,22,183,14,196,
 11,32,0,88,163,8,36,36,41,11,9,222,11,28,192,249,22,73,195,194,11,
 27,252,22,166,14,23,200,1,23,202,1,2,28,247,22,153,8,249,80,159,46,
-39,38,23,201,1,80,159,46,36,38,27,250,22,183,14,196,11,32,0,88,163,
+39,39,23,201,1,80,159,46,36,38,27,250,22,183,14,196,11,32,0,88,163,
 8,36,36,41,11,9,222,11,28,192,249,22,73,195,194,11,27,250,22,166,14,
-23,198,1,23,200,1,249,80,159,44,39,38,23,199,1,2,26,27,250,22,183,
+23,198,1,23,200,1,249,80,159,44,39,39,23,199,1,2,26,27,250,22,183,
 14,196,11,32,0,88,163,8,36,36,41,11,9,222,11,28,192,249,22,73,195,
-194,11,27,250,22,166,14,23,198,1,23,200,1,249,80,159,44,39,38,23,199,
+194,11,27,250,22,166,14,23,198,1,23,200,1,249,80,159,44,39,39,23,199,
 1,2,27,27,250,22,183,14,196,11,32,0,88,163,8,36,36,41,11,9,222,
-11,28,192,249,22,73,195,194,11,86,94,28,248,80,159,37,38,38,23,195,2,
+11,28,192,249,22,73,195,194,11,86,94,28,248,80,159,37,38,39,23,195,2,
 12,250,22,176,9,77,108,111,97,100,47,117,115,101,45,99,111,109,112,105,108,
 101,100,6,25,25,112,97,116,104,32,111,114,32,118,97,108,105,100,45,112,97,
 116,104,32,115,116,114,105,110,103,23,197,2,90,159,46,11,89,161,37,36,11,
@@ -702,18 +610,18 @@
 75,196,248,22,75,23,205,2,193,11,11,11,11,86,94,23,197,1,11,28,23,
 193,2,86,105,23,213,1,23,211,1,23,210,1,23,209,1,23,208,1,23,201,
 1,23,200,1,23,199,1,23,198,1,23,196,1,23,195,1,23,194,1,20,13,
-159,80,159,57,40,38,250,80,159,8,24,41,38,249,22,27,11,80,159,8,26,
-40,38,22,180,4,11,20,13,159,80,159,57,40,38,250,80,159,8,24,41,38,
-249,22,27,11,80,159,8,26,40,38,22,159,5,28,248,22,148,14,23,216,2,
+159,80,159,57,40,37,250,80,159,8,24,41,37,249,22,27,11,80,159,8,26,
+40,37,22,180,4,11,20,13,159,80,159,57,40,37,250,80,159,8,24,41,37,
+249,22,27,11,80,159,8,26,40,37,22,159,5,28,248,22,148,14,23,216,2,
 23,215,1,86,94,23,215,1,247,22,189,14,249,247,22,130,15,248,22,74,195,
 23,25,86,94,23,193,1,27,28,23,195,2,28,23,197,1,27,249,22,5,88,
 163,8,36,37,53,45,9,225,25,23,20,33,41,23,217,2,27,28,23,204,2,
 11,193,28,192,192,28,193,28,203,28,249,22,188,3,248,22,75,196,248,22,75,
 206,193,11,11,11,11,86,94,23,197,1,11,28,23,193,2,86,102,23,214,1,
 23,211,1,23,210,1,23,209,1,23,201,1,23,200,1,23,199,1,23,196,1,
-23,195,1,20,13,159,80,159,58,40,38,250,80,159,8,25,41,38,249,22,27,
-11,80,159,8,27,40,38,22,180,4,23,215,1,20,13,159,80,159,58,40,38,
-250,80,159,8,25,41,38,249,22,27,11,80,159,8,27,40,38,22,159,5,28,
+23,195,1,20,13,159,80,159,58,40,37,250,80,159,8,25,41,37,249,22,27,
+11,80,159,8,27,40,37,22,180,4,23,215,1,20,13,159,80,159,58,40,37,
+250,80,159,8,25,41,37,249,22,27,11,80,159,8,27,40,37,22,159,5,28,
 248,22,148,14,23,217,2,23,216,1,86,94,23,216,1,247,22,189,14,249,247,
 22,130,15,248,22,74,195,23,26,86,94,23,193,1,27,28,23,197,2,28,23,
 201,1,27,249,22,5,20,20,94,88,163,8,36,37,51,44,9,225,26,24,20,
@@ -721,24 +629,24 @@
 23,204,2,28,249,22,188,3,248,22,75,196,248,22,75,23,207,2,193,11,11,
 11,86,94,23,210,1,11,86,94,23,201,1,11,28,23,193,2,86,101,23,215,
 1,23,213,1,23,212,1,23,211,1,23,202,1,23,200,1,23,197,1,23,196,
-1,20,13,159,80,159,59,40,38,250,80,159,8,26,41,38,249,22,27,11,80,
-159,8,28,40,38,22,180,4,11,20,13,159,80,159,59,40,38,250,80,159,8,
-26,41,38,249,22,27,11,80,159,8,28,40,38,22,159,5,28,248,22,148,14,
+1,20,13,159,80,159,59,40,37,250,80,159,8,26,41,37,249,22,27,11,80,
+159,8,28,40,37,22,180,4,11,20,13,159,80,159,59,40,37,250,80,159,8,
+26,41,37,249,22,27,11,80,159,8,28,40,37,22,159,5,28,248,22,148,14,
 23,218,2,23,217,1,86,94,23,217,1,247,22,189,14,249,247,22,157,5,248,
 22,74,195,23,27,86,94,23,193,1,27,28,23,197,1,28,23,201,1,27,249,
 22,5,20,20,94,88,163,8,36,37,51,44,9,225,27,25,22,33,43,23,215,
 1,23,219,1,27,28,23,205,2,11,193,28,192,192,28,193,28,204,28,249,22,
 188,3,248,22,75,196,248,22,75,23,15,193,11,11,11,86,95,23,216,1,23,
 212,1,11,86,94,23,201,1,11,28,23,193,2,86,95,23,213,1,23,198,1,
-20,13,159,80,159,8,24,40,38,250,80,159,8,27,41,38,249,22,27,11,80,
-159,8,29,40,38,22,180,4,23,217,1,20,13,159,80,159,8,24,40,38,250,
-80,159,8,27,41,38,249,22,27,11,80,159,8,29,40,38,22,159,5,28,248,
+20,13,159,80,159,8,24,40,37,250,80,159,8,27,41,37,249,22,27,11,80,
+159,8,29,40,37,22,180,4,23,217,1,20,13,159,80,159,8,24,40,37,250,
+80,159,8,27,41,37,249,22,27,11,80,159,8,29,40,37,22,159,5,28,248,
 22,148,14,23,219,2,23,218,1,86,94,23,218,1,247,22,189,14,249,247,22,
 157,5,248,22,74,195,23,28,86,94,23,193,1,27,28,23,199,2,86,94,23,
 215,1,23,214,1,86,94,23,214,1,23,215,1,20,13,159,80,159,8,25,40,
-38,250,80,159,8,28,41,38,249,22,27,11,80,159,8,30,40,38,22,180,4,
+37,250,80,159,8,28,41,37,249,22,27,11,80,159,8,30,40,37,22,180,4,
 28,23,30,28,23,202,1,11,195,86,94,23,202,1,11,20,13,159,80,159,8,
-25,40,38,250,80,159,8,28,41,38,249,22,27,11,80,159,8,30,40,38,22,
+25,40,37,250,80,159,8,28,41,37,249,22,27,11,80,159,8,30,40,37,22,
 159,5,28,248,22,148,14,23,220,2,23,219,1,86,94,23,219,1,247,22,189,
 14,249,247,22,157,5,194,23,29,27,249,22,160,8,80,159,39,45,38,249,22,
 183,3,248,22,179,3,248,22,166,2,200,8,128,8,27,28,193,248,22,169,2,
@@ -755,202 +663,173 @@
 196,2,27,248,22,107,23,197,1,27,249,22,135,15,2,47,23,196,2,28,23,
 193,2,86,94,23,194,1,249,22,73,248,22,98,23,196,2,248,2,48,248,22,
 107,23,197,1,248,22,83,194,248,22,83,194,248,22,83,194,248,22,83,194,32,
-50,88,163,36,37,8,40,11,2,29,222,33,51,28,248,22,81,248,22,75,23,
-195,2,249,22,7,9,248,22,74,195,27,248,22,75,194,90,159,38,11,89,161,
-38,36,11,28,248,22,81,248,22,75,23,197,2,249,22,7,9,248,22,74,197,
-90,159,38,11,89,161,38,36,11,27,248,22,75,198,28,248,22,81,248,22,75,
-23,195,2,249,22,7,9,248,22,74,195,27,248,22,75,194,90,159,38,11,89,
-161,38,36,11,28,248,22,81,248,22,75,23,197,2,249,22,7,9,248,22,74,
-197,90,159,38,11,89,161,38,36,11,27,248,22,75,198,28,248,22,81,248,22,
-75,23,195,2,249,22,7,9,248,22,74,195,27,248,22,75,194,90,159,38,11,
-89,161,38,36,11,28,248,22,81,248,22,75,23,197,2,249,22,7,9,248,22,
-74,197,90,159,38,11,89,161,38,36,11,27,248,22,75,198,28,248,22,81,248,
+50,88,163,36,37,55,11,2,29,222,33,51,28,248,22,81,248,22,75,23,195,
+2,249,22,7,9,248,22,74,195,90,159,38,11,89,161,38,36,11,27,248,22,
+75,196,28,248,22,81,248,22,75,23,195,2,249,22,7,9,248,22,74,195,90,
+159,38,11,89,161,38,36,11,27,248,22,75,196,28,248,22,81,248,22,75,23,
+195,2,249,22,7,9,248,22,74,195,90,159,38,11,89,161,38,36,11,248,2,
+50,248,22,75,196,249,22,7,249,22,73,248,22,74,199,196,195,249,22,7,249,
+22,73,248,22,74,199,196,195,249,22,7,249,22,73,248,22,74,199,196,195,27,
+27,249,22,135,15,2,47,23,197,2,28,23,193,2,86,94,23,195,1,249,22,
+73,248,22,98,23,196,2,27,248,22,107,23,197,1,27,249,22,135,15,2,47,
+23,196,2,28,23,193,2,86,94,23,194,1,249,22,73,248,22,98,23,196,2,
+27,248,22,107,23,197,1,27,249,22,135,15,2,47,23,196,2,28,23,193,2,
+86,94,23,194,1,249,22,73,248,22,98,23,196,2,27,248,22,107,23,197,1,
+27,249,22,135,15,2,47,23,196,2,28,23,193,2,86,94,23,194,1,249,22,
+73,248,22,98,23,196,2,248,2,48,248,22,107,23,197,1,248,22,83,194,248,
+22,83,194,248,22,83,194,248,22,83,195,28,23,195,1,192,28,248,22,81,248,
 22,75,23,195,2,249,22,7,9,248,22,74,195,27,248,22,75,194,90,159,38,
 11,89,161,38,36,11,28,248,22,81,248,22,75,23,197,2,249,22,7,9,248,
-22,74,197,90,159,38,11,89,161,38,36,11,27,248,22,75,198,28,248,22,81,
-248,22,75,23,195,2,249,22,7,9,248,22,74,195,27,248,22,75,194,90,159,
-38,11,89,161,38,36,11,28,248,22,81,248,22,75,23,197,2,249,22,7,9,
-248,22,74,197,90,159,38,11,89,161,38,36,11,248,2,50,248,22,75,198,249,
-22,7,249,22,73,248,22,74,201,196,195,249,22,7,249,22,73,248,22,74,200,
-196,195,249,22,7,249,22,73,248,22,74,201,196,195,249,22,7,249,22,73,248,
-22,74,200,196,195,249,22,7,249,22,73,248,22,74,201,196,195,249,22,7,249,
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-    EVAL_ONE_SIZED_STR((char *)expr, 6861);
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+114,101,115,111,108,118,101,100,45,109,111,100,117,108,101,45,112,97,116,104,197,
+28,24,193,2,248,24,194,1,195,86,94,23,193,1,12,27,250,22,153,2,80,
+159,41,43,38,248,22,160,15,247,22,190,12,11,27,28,23,194,2,193,86,94,
+23,194,1,27,247,22,133,2,86,94,250,22,151,2,80,159,43,43,38,248,22,
+160,15,247,22,190,12,195,192,250,22,151,2,195,199,66,97,116,116,97,99,104,
+251,211,197,198,199,10,28,192,250,22,175,9,11,196,195,248,22,173,9,194,28,
+249,22,136,7,194,6,1,1,46,2,25,28,249,22,136,7,194,6,2,2,46,
+46,62,117,112,192,32,57,88,163,8,36,37,50,11,67,115,115,45,62,114,107,
+116,222,33,58,27,248,22,133,7,194,28,249,22,188,3,194,39,28,249,22,136,
+7,6,3,3,46,115,115,249,22,152,7,197,249,22,176,3,198,39,249,22,153,
+7,250,22,152,7,198,36,249,22,176,3,199,39,6,4,4,46,114,107,116,193,
+193,28,249,22,142,9,248,22,75,23,200,2,23,197,1,28,249,22,140,9,248,
+22,74,23,200,2,23,196,1,251,22,173,9,2,21,6,28,28,99,121,99,108,
+101,32,105,110,32,108,111,97,100,105,110,103,32,97,116,32,126,46,115,58,32,
+126,46,115,23,200,1,249,22,2,22,75,248,22,88,249,22,73,23,206,1,23,
+202,1,12,12,247,192,20,13,159,80,159,40,48,38,249,22,73,248,22,160,15,
+247,22,190,12,23,197,1,20,13,159,80,159,40,40,37,250,80,159,43,41,37,
+249,22,27,11,80,159,45,40,37,22,179,4,23,196,1,249,247,22,158,5,23,
+198,1,248,22,61,248,22,152,14,23,198,1,86,94,28,28,248,22,148,14,23,
+196,2,10,248,22,143,5,23,196,2,12,28,23,197,2,250,22,175,9,11,6,
+15,15,98,97,100,32,109,111,100,117,108,101,32,112,97,116,104,23,200,2,250,
+22,176,9,2,21,6,19,19,109,111,100,117,108,101,45,112,97,116,104,32,111,
+114,32,112,97,116,104,23,198,2,28,28,248,22,71,23,196,2,249,22,140,9,
+248,22,74,23,198,2,2,4,11,248,22,136,5,248,22,98,196,28,28,248,22,
+71,23,196,2,249,22,140,9,248,22,74,23,198,2,66,112,108,97,110,101,116,
+11,86,94,28,207,12,20,13,159,80,159,37,55,37,80,158,37,53,89,161,37,
+36,10,249,22,181,4,21,94,2,30,6,19,19,112,108,97,110,101,116,47,114,
+101,115,111,108,118,101,114,46,114,107,116,1,27,112,108,97,110,101,116,45,109,
+111,100,117,108,101,45,110,97,109,101,45,114,101,115,111,108,118,101,114,12,252,
+212,199,200,201,202,80,158,42,53,86,94,23,193,1,27,88,163,8,36,37,46,
+11,79,115,104,111,119,45,99,111,108,108,101,99,116,105,111,110,45,101,114,114,
+223,5,33,55,27,28,248,22,58,23,198,2,27,248,80,159,41,46,39,249,22,
+73,23,201,2,247,22,190,14,28,23,193,2,192,86,94,23,193,1,90,159,38,
+11,89,161,38,36,11,249,80,159,44,52,39,248,22,64,23,203,2,11,27,28,
+248,22,81,23,195,2,6,8,8,109,97,105,110,46,114,107,116,249,22,153,7,
+23,197,2,6,4,4,46,114,107,116,27,252,80,159,49,57,39,2,21,23,204,
+1,28,248,22,81,23,201,2,23,201,1,86,94,23,201,1,248,22,74,23,201,
+2,28,248,22,81,23,201,2,86,94,23,200,1,9,248,22,75,23,201,1,23,
+199,2,249,22,166,14,23,195,1,23,196,1,28,248,22,130,7,23,198,2,86,
+94,23,194,1,27,248,80,159,41,8,26,39,23,200,2,27,248,80,159,42,46,
+39,249,22,73,23,202,2,23,197,2,28,23,193,2,192,86,94,23,193,1,90,
+159,38,11,89,161,38,36,11,249,80,159,45,52,39,23,203,2,11,250,22,1,
+22,166,14,23,199,1,249,22,87,249,22,2,32,0,88,163,8,36,37,44,11,
+9,222,33,56,23,200,1,248,22,83,248,2,57,23,201,1,28,248,22,148,14,
+23,198,2,86,94,23,194,1,28,248,22,171,14,23,198,2,248,80,159,40,8,
+27,39,248,22,175,14,23,199,2,248,22,83,6,26,26,32,40,97,32,112,97,
+116,104,32,109,117,115,116,32,98,101,32,97,98,115,111,108,117,116,101,41,28,
+249,22,140,9,248,22,74,23,200,2,2,30,27,248,80,159,41,46,39,249,22,
+73,23,201,2,247,22,190,14,28,23,193,2,192,86,94,23,193,1,90,159,39,
+11,89,161,38,36,11,249,80,159,45,52,39,248,22,98,23,204,2,11,89,161,
+37,38,11,28,248,22,81,248,22,100,23,203,2,28,248,22,81,23,194,2,249,
+22,139,15,0,8,35,114,120,34,91,46,93,34,23,196,2,11,10,27,28,23,
+196,2,248,2,57,23,196,2,28,248,22,81,23,195,2,6,8,8,109,97,105,
+110,46,114,107,116,28,249,22,139,15,0,8,35,114,120,34,91,46,93,34,23,
+197,2,248,2,57,23,196,2,249,22,153,7,23,197,2,6,4,4,46,114,107,
+116,27,28,23,197,1,86,94,23,196,1,249,22,87,28,248,22,81,248,22,100,
+23,207,2,21,93,6,5,5,109,122,108,105,98,249,22,1,22,87,249,22,2,
+80,159,51,8,28,39,248,22,100,23,210,2,23,197,1,28,248,22,81,23,196,
+2,86,94,23,195,1,248,22,83,23,197,1,86,94,23,196,1,23,195,1,27,
+252,80,159,51,57,39,2,21,23,206,1,248,22,74,23,200,2,248,22,75,23,
+200,1,23,200,2,249,22,166,14,23,195,1,23,197,1,28,249,22,140,9,248,
+22,74,23,200,2,64,102,105,108,101,248,80,159,40,8,27,39,248,22,175,14,
+249,22,173,14,248,22,177,14,248,22,98,23,203,2,248,80,159,44,8,26,39,
+23,203,2,12,86,94,28,28,248,22,148,14,23,194,2,10,248,22,155,8,23,
+194,2,86,94,23,199,1,12,28,23,199,2,250,22,175,9,67,114,101,113,117,
+105,114,101,249,22,178,7,6,17,17,98,97,100,32,109,111,100,117,108,101,32,
+112,97,116,104,126,97,28,23,198,2,248,22,74,23,199,2,6,0,0,23,202,
+1,86,94,23,199,1,250,22,176,9,2,21,249,22,178,7,6,13,13,109,111,
+100,117,108,101,32,112,97,116,104,126,97,28,23,198,2,248,22,74,23,199,2,
+6,0,0,23,200,2,27,28,248,22,155,8,23,195,2,249,22,160,8,23,196,
+2,36,249,22,175,14,248,22,176,14,23,197,2,11,27,28,248,22,155,8,23,
+196,2,249,22,160,8,23,197,2,37,248,80,159,42,58,39,23,195,2,90,159,
+39,11,89,161,39,36,11,28,248,22,155,8,23,199,2,250,22,7,2,31,249,
+22,160,8,23,203,2,38,2,31,248,22,169,14,23,198,2,86,95,23,195,1,
+23,193,1,27,28,248,22,155,8,23,200,2,249,22,160,8,23,201,2,39,249,
+80,159,47,56,39,23,197,2,5,0,27,28,248,22,155,8,23,201,2,249,22,
+160,8,23,202,2,40,248,22,136,5,23,200,2,27,27,250,22,153,2,80,159,
+51,43,38,248,22,160,15,247,22,190,12,11,28,23,193,2,192,86,94,23,193,
+1,27,247,22,133,2,86,94,250,22,151,2,80,159,52,43,38,248,22,160,15,
+247,22,190,12,195,192,86,95,28,23,208,1,27,250,22,153,2,23,197,2,197,
+11,28,23,193,1,12,86,95,27,27,28,248,22,17,80,159,51,49,38,80,159,
+50,49,38,247,22,19,250,22,25,248,22,23,23,197,2,80,159,53,48,38,23,
+196,1,27,248,22,160,15,247,22,190,12,249,22,3,20,20,94,88,163,8,36,
+37,55,11,9,226,12,11,2,3,33,59,23,195,1,23,196,1,248,28,248,22,
+17,80,159,50,49,38,32,0,88,163,36,37,42,11,9,222,33,60,80,159,49,
+8,29,39,88,163,36,36,51,8,176,64,9,227,13,9,8,4,3,33,61,250,
+22,151,2,23,197,1,197,10,12,28,28,248,22,155,8,23,202,1,11,28,248,
+22,130,7,23,206,2,10,28,248,22,58,23,206,2,10,28,248,22,71,23,206,
+2,249,22,140,9,248,22,74,23,208,2,2,30,11,27,28,248,22,130,7,23,
+207,2,249,22,73,23,208,1,248,80,159,51,8,26,39,23,210,1,86,94,23,
+207,1,249,22,73,23,208,1,247,22,190,14,27,249,22,183,3,248,22,179,3,
+248,22,166,2,23,198,2,8,128,8,27,249,22,160,8,80,159,52,45,38,23,
+196,2,27,28,23,194,2,248,22,169,2,23,195,1,86,94,23,194,1,11,250,
+22,161,8,80,159,54,45,38,23,198,1,248,22,168,2,249,22,73,249,22,73,
+23,204,1,252,22,157,8,23,217,1,23,216,1,23,214,1,23,212,1,23,18,
+28,23,199,2,23,199,1,86,94,23,199,1,9,12,193,86,96,20,18,159,11,
+80,158,36,53,248,80,159,37,8,25,37,249,22,27,11,80,159,39,55,37,248,
+22,178,4,80,159,37,54,38,248,22,158,5,80,159,37,37,39,248,22,181,13,
+80,159,37,42,39,20,18,159,11,80,158,36,53,248,80,159,37,8,25,37,249,
+22,27,11,80,159,39,55,37,159,36,20,112,159,36,16,1,11,16,0,20,26,
+142,2,1,2,1,29,11,11,11,11,11,10,38,80,158,36,36,20,112,159,40,
+16,26,2,2,2,3,30,2,5,72,112,97,116,104,45,115,116,114,105,110,103,
+63,11,30,2,5,75,112,97,116,104,45,97,100,100,45,115,117,102,102,105,120,
+8,30,2,7,2,8,5,30,2,7,1,23,101,120,116,101,110,100,45,112,97,
+114,97,109,101,116,101,114,105,122,97,116,105,111,110,3,2,9,2,10,2,11,
+2,12,2,13,2,14,2,15,2,16,2,17,2,18,2,19,2,20,2,21,30,
+2,22,2,8,5,30,2,5,79,112,97,116,104,45,114,101,112,108,97,99,101,
+45,115,117,102,102,105,120,10,30,2,5,73,102,105,110,100,45,99,111,108,45,
+102,105,108,101,3,30,2,5,76,110,111,114,109,97,108,45,99,97,115,101,45,
+112,97,116,104,7,2,23,2,24,30,2,22,74,114,101,112,97,114,97,109,101,
+116,101,114,105,122,101,6,16,0,16,0,36,16,0,36,16,14,2,15,2,16,
+2,10,2,12,2,17,2,18,2,11,2,3,2,9,2,2,2,13,2,14,2,
+19,2,21,50,11,11,39,36,11,11,16,3,2,23,2,20,2,24,16,3,11,
+11,11,16,3,2,23,2,20,2,24,39,39,37,11,11,16,0,16,0,16,0,
+36,36,11,11,11,16,0,16,0,16,0,36,36,16,0,16,21,20,15,16,2,
+88,163,36,37,45,8,128,128,9,223,0,33,32,80,159,36,8,29,39,20,15,
+16,2,88,163,8,36,37,45,8,240,0,0,1,0,9,223,0,33,33,80,159,
+36,8,28,39,20,15,16,2,88,163,36,37,49,8,240,0,0,16,0,72,112,
+97,116,104,45,115,115,45,62,114,107,116,223,0,33,34,80,159,36,8,27,39,
+20,15,16,2,88,163,36,37,49,8,240,0,192,0,0,67,103,101,116,45,100,
+105,114,223,0,33,35,80,159,36,8,26,39,20,15,16,2,248,22,152,8,69,
+115,111,45,115,117,102,102,105,120,80,159,36,36,37,20,15,16,2,88,163,36,
+38,8,38,8,61,2,3,223,0,33,44,80,159,36,37,37,20,15,16,2,32,
+0,88,163,8,36,37,42,11,2,9,222,192,80,159,36,42,37,20,15,16,2,
+247,22,136,2,80,159,36,43,37,20,15,16,2,8,128,8,80,159,36,44,37,
+20,15,16,2,249,22,156,8,8,128,8,11,80,159,36,45,37,20,15,16,2,
+88,163,8,36,37,50,8,128,8,2,13,223,0,33,45,80,159,36,46,37,20,
+15,16,2,88,163,8,36,38,55,8,128,8,2,14,223,0,33,46,80,159,36,
+47,37,20,15,16,2,247,22,69,80,159,36,48,37,20,15,16,2,248,22,18,
+74,109,111,100,117,108,101,45,108,111,97,100,105,110,103,80,159,36,49,37,20,
+15,16,2,11,80,158,36,50,20,15,16,2,11,80,158,36,51,20,15,16,2,
+32,0,88,163,36,38,8,25,11,2,19,222,33,52,80,159,36,52,37,20,15,
+16,2,11,80,158,36,53,20,15,16,2,27,11,20,19,158,36,90,159,37,10,
+89,161,37,36,10,20,25,96,2,21,88,163,8,36,37,51,8,128,2,9,224,
+2,1,33,53,88,163,36,39,49,11,9,223,0,33,54,88,163,36,40,8,38,
+16,2,8,176,218,8,187,241,9,224,2,1,33,62,207,80,159,36,54,37,20,
+15,16,2,88,163,36,36,45,8,240,66,0,14,2,2,23,223,0,33,63,80,
+159,36,59,37,20,15,16,2,88,163,8,36,36,45,8,240,0,0,10,2,2,
+24,223,0,33,64,80,159,36,8,24,37,96,29,94,2,4,68,35,37,107,101,
+114,110,101,108,11,29,94,2,4,69,35,37,109,105,110,45,115,116,120,11,2,
+5,2,22,9,9,9,36,0};
+    EVAL_ONE_SIZED_STR((char *)expr, 6244);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,50,46,52,0,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,53,46,49,46,51,46,50,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,11,0,0,0,1,0,0,10,0,16,0,29,
 0,44,0,58,0,78,0,90,0,104,0,118,0,170,0,0,0,97,1,0,0,
 69,35,37,98,117,105,108,116,105,110,65,113,117,111,116,101,29,94,2,2,67,
@@ -958,7 +837,7 @@
 107,11,29,94,2,2,68,35,37,112,97,114,97,109,122,11,29,94,2,2,74,
 35,37,112,108,97,99,101,45,115,116,114,117,99,116,11,29,94,2,2,66,35,
 37,98,111,111,116,11,29,94,2,2,68,35,37,101,120,112,111,98,115,11,29,
-94,2,2,68,35,37,107,101,114,110,101,108,11,97,36,11,8,240,0,77,0,
+94,2,2,68,35,37,107,101,114,110,101,108,11,97,36,11,8,240,204,77,0,
 0,100,159,2,3,36,36,159,2,4,36,36,159,2,5,36,36,159,2,6,36,
 36,159,2,7,36,36,159,2,8,36,36,159,2,9,36,36,159,2,9,36,36,
 16,0,159,36,20,112,159,36,16,1,11,16,0,20,26,142,2,1,2,1,29,
diff --git a/src/racket/src/eval.c b/src/racket/src/eval.c
index 14363fc5fd..aa59ea2e20 100644
--- a/src/racket/src/eval.c
+++ b/src/racket/src/eval.c
@@ -1708,7 +1708,7 @@ define_execute_with_dynamic_state(Scheme_Object *vec, int delta, int defmacro,
 	  scheme_set_global_bucket("define-values", b, values[i], 1);
 	  scheme_shadow(scheme_get_bucket_home(b), (Scheme_Object *)b->key, 1);
 
-	  if (SCHEME_TOPLEVEL_FLAGS(var) & SCHEME_TOPLEVEL_CONST) {
+	  if (SCHEME_TOPLEVEL_FLAGS(var) & SCHEME_TOPLEVEL_SEAL) {
             ((Scheme_Bucket_With_Flags *)b)->flags |= GLOB_IS_IMMUTATED;
 	  }
 	}
@@ -1740,7 +1740,7 @@ define_execute_with_dynamic_state(Scheme_Object *vec, int delta, int defmacro,
       scheme_set_global_bucket("define-values", b, vals, 1);
       scheme_shadow(scheme_get_bucket_home(b), (Scheme_Object *)b->key, 1);
       
-      if (SCHEME_TOPLEVEL_FLAGS(var) & SCHEME_TOPLEVEL_CONST) {
+      if (SCHEME_TOPLEVEL_FLAGS(var) & SCHEME_TOPLEVEL_SEAL) {
         int flags = GLOB_IS_IMMUTATED;
         if (SCHEME_PROCP(vals_expr) 
             || SAME_TYPE(SCHEME_TYPE(vals_expr), scheme_unclosed_procedure_type)
diff --git a/src/racket/src/jit.c b/src/racket/src/jit.c
index c6221c3518..77ae9e551c 100644
--- a/src/racket/src/jit.c
+++ b/src/racket/src/jit.c
@@ -504,7 +504,7 @@ int scheme_is_noncm(Scheme_Object *a, mz_jit_state *jitter, int depth, int stack
   if (depth 
       && jitter->nc 
       && SAME_TYPE(SCHEME_TYPE(a), scheme_toplevel_type)
-      && (SCHEME_TOPLEVEL_FLAGS(a) & SCHEME_TOPLEVEL_CONST)) {
+      && ((SCHEME_TOPLEVEL_FLAGS(a) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_CONST)) {
     Scheme_Object *p;
     p = scheme_extract_global(a, jitter->nc);
     p = ((Scheme_Bucket *)p)->val;
@@ -722,7 +722,7 @@ static int is_a_procedure(Scheme_Object *v, mz_jit_state *jitter)
     int flags;
     return scheme_mz_is_closure(jitter, SCHEME_LOCAL_POS(v), -1, &flags);
   } else if (t == scheme_toplevel_type) {
-    if (SCHEME_TOPLEVEL_FLAGS(v) & SCHEME_TOPLEVEL_CONST) {
+    if ((SCHEME_TOPLEVEL_FLAGS(v) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_CONST) {
       if (jitter->nc) {
 	Scheme_Object *p;
         
@@ -755,18 +755,26 @@ int scheme_ok_to_delay_local(Scheme_Object *obj)
     return 0;
 }
 
+int scheme_can_delay_and_avoids_r1_r2(Scheme_Object *obj)
+{
+  Scheme_Type t = SCHEME_TYPE(obj);
+
+  if (SAME_TYPE(t, scheme_local_type) && scheme_ok_to_delay_local(obj)) {
+    return 1;
+  } else
+    return (t >= _scheme_compiled_values_types_);
+}
+
 int scheme_can_delay_and_avoids_r1(Scheme_Object *obj)
 {
   Scheme_Type t = SCHEME_TYPE(obj);
 
   if (SAME_TYPE(t, scheme_toplevel_type)) {
-    return ((SCHEME_TOPLEVEL_FLAGS(obj) & SCHEME_TOPLEVEL_CONST)
+    return (((SCHEME_TOPLEVEL_FLAGS(obj) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_FIXED)
             ? 1
             : 0);
-  } else if (SAME_TYPE(t, scheme_local_type) && scheme_ok_to_delay_local(obj)) {
-    return 1;
   } else
-    return (t >= _scheme_compiled_values_types_);
+    return scheme_can_delay_and_avoids_r1_r2(obj);
 }
 
 int scheme_is_constant_and_avoids_r1(Scheme_Object *obj)
@@ -774,7 +782,7 @@ int scheme_is_constant_and_avoids_r1(Scheme_Object *obj)
   Scheme_Type t = SCHEME_TYPE(obj);
 
   if (SAME_TYPE(t, scheme_toplevel_type)) {
-    return ((SCHEME_TOPLEVEL_FLAGS(obj) & SCHEME_TOPLEVEL_CONST)
+    return (((SCHEME_TOPLEVEL_FLAGS(obj) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_FIXED)
             ? 1
             : 0);
   } else if (SAME_TYPE(t, scheme_local_type) && scheme_ok_to_move_local(obj)) {
@@ -1813,8 +1821,7 @@ int scheme_generate(Scheme_Object *obj, mz_jit_state *jitter, int is_tail, int w
     {
       int can_fail;
       /* Other parts of the JIT rely on this code not modifying R1 */
-      can_fail = !(SCHEME_TOPLEVEL_FLAGS(obj) 
-                   & (SCHEME_TOPLEVEL_CONST | SCHEME_TOPLEVEL_READY));
+      can_fail = ((SCHEME_TOPLEVEL_FLAGS(obj) & SCHEME_TOPLEVEL_FLAGS_MASK) < SCHEME_TOPLEVEL_READY);
       if (!can_fail && result_ignored) {
         /* skip */
       } else {
diff --git a/src/racket/src/jit.h b/src/racket/src/jit.h
index a0c8162898..32579f9084 100644
--- a/src/racket/src/jit.h
+++ b/src/racket/src/jit.h
@@ -1243,6 +1243,7 @@ void scheme_add_branch_false_movi(Branch_Info *for_branch, jit_insn *ref);
 int scheme_ok_to_move_local(Scheme_Object *obj);
 int scheme_ok_to_delay_local(Scheme_Object *obj);
 int scheme_can_delay_and_avoids_r1(Scheme_Object *obj);
+int scheme_can_delay_and_avoids_r1_r2(Scheme_Object *obj);
 int scheme_is_constant_and_avoids_r1(Scheme_Object *obj);
 int scheme_is_relatively_constant_and_avoids_r1_maybe_fp(Scheme_Object *obj, Scheme_Object *wrt,
                                                          int fp_ok);
diff --git a/src/racket/src/jitcall.c b/src/racket/src/jitcall.c
index 42f84d8748..d2321f1756 100644
--- a/src/racket/src/jitcall.c
+++ b/src/racket/src/jitcall.c
@@ -1399,11 +1399,12 @@ int scheme_generate_app(Scheme_App_Rec *app, Scheme_Object **alt_rands, int num_
 	}
       }
     } else if (t == scheme_toplevel_type) {
-      if (SCHEME_TOPLEVEL_FLAGS(rator) & SCHEME_TOPLEVEL_CONST) {
+      if (0 && (SCHEME_TOPLEVEL_FLAGS(rator) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_FIXED) {
         /* We can re-order evaluation of the rator. */
         reorder_ok = 1;
 
-        if (jitter->nc) {
+        if (jitter->nc && 0
+            && ((SCHEME_TOPLEVEL_FLAGS(rator) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_CONST)) {
           Scheme_Object *p;
 
           p = scheme_extract_global(rator, jitter->nc);
diff --git a/src/racket/src/jitinline.c b/src/racket/src/jitinline.c
index eee5d6201e..6e2730bc7f 100644
--- a/src/racket/src/jitinline.c
+++ b/src/racket/src/jitinline.c
@@ -2891,7 +2891,7 @@ int scheme_generate_inlined_nary(mz_jit_state *jitter, Scheme_App_Rec *app, int
 
       LOG_IT(("inlined vector-set!\n"));
 
-      if (scheme_can_delay_and_avoids_r1(app->args[1]))
+      if (scheme_can_delay_and_avoids_r1_r2(app->args[1]))
         can_delay_vec = 1;
       else
         can_delay_vec = 0;
diff --git a/src/racket/src/module.c b/src/racket/src/module.c
index d600718535..363d0d9e9f 100644
--- a/src/racket/src/module.c
+++ b/src/racket/src/module.c
@@ -3430,6 +3430,19 @@ static Scheme_Module *module_load(Scheme_Object *name, Scheme_Env *env, const ch
   return m;
 }
 
+static int is_procedure_expression(Scheme_Object *e)
+{
+  Scheme_Type t;
+
+  if (SCHEME_PROCP(e))
+    return 1;
+
+  t = SCHEME_TYPE(e);
+
+  return ((t == scheme_unclosed_procedure_type)
+          || (t == scheme_case_lambda_sequence_type));
+}
+
 static void setup_accessible_table(Scheme_Module *m)
 {
   if (!m->accessible) {
@@ -3484,7 +3497,7 @@ static void setup_accessible_table(Scheme_Module *m)
             if (SAME_TYPE(SCHEME_TYPE(form), scheme_define_values_type)) {
               for (k = SCHEME_VEC_SIZE(form); k-- > 1; ) {
                 tl = SCHEME_VEC_ELS(form)[k];
-                if (SCHEME_TOPLEVEL_FLAGS(tl) & SCHEME_TOPLEVEL_CONST) {
+                if (SCHEME_TOPLEVEL_FLAGS(tl) & SCHEME_TOPLEVEL_SEAL) {
                   int pos = SCHEME_TOPLEVEL_POS(tl);
                   if (pos < m->prefix->num_toplevels) {
                     tl = m->prefix->toplevels[pos];
@@ -3496,9 +3509,12 @@ static void setup_accessible_table(Scheme_Module *m)
                           && scheme_compiled_duplicate_ok(SCHEME_VEC_ELS(form)[0], 1)) {
                         /* record simple constant from cross-module propagation: */
                         v = scheme_make_pair(v, SCHEME_VEC_ELS(form)[0]);
+                      } else if (is_procedure_expression(SCHEME_VEC_ELS(form)[0])) {
+                        /* record that it's constant across all instantiations: */
+                        v = scheme_make_pair(v, scheme_constant_key);
                       } else {
-                        /* record simply that it's constant: */
-                        v = scheme_box(v);
+                        /* record that it's fixed for any given instantiations: */
+                        v = scheme_make_pair(v, scheme_fixed_key);
                       }
                       scheme_hash_set(ht, tl, v);
                     } else
@@ -3715,10 +3731,7 @@ Scheme_Object *scheme_check_accessible_in_module(Scheme_Env *env, Scheme_Object
         pos = NULL;
 
       if (pos) {
-        if (SCHEME_BOXP(pos)) {
-          if (_is_constant) *_is_constant = scheme_void_proc; /* a hack to indicated "unknown constant" */
-          pos = SCHEME_BOX_VAL(pos);
-        } else if (SCHEME_PAIRP(pos)) {
+        if (SCHEME_PAIRP(pos)) {
           if (_is_constant) *_is_constant = SCHEME_CDR(pos);
           pos = SCHEME_CAR(pos);
         }
diff --git a/src/racket/src/optimize.c b/src/racket/src/optimize.c
index 2e3e698588..511df50a46 100644
--- a/src/racket/src/optimize.c
+++ b/src/racket/src/optimize.c
@@ -231,8 +231,7 @@ int scheme_omittable_expr(Scheme_Object *o, int vals, int fuel, int resolved,
   if (vtype == scheme_toplevel_type) {
     note_match(1, vals, warn_info);
     if (resolved && ((vals == 1) || (vals < 0))) {
-      if (SCHEME_TOPLEVEL_FLAGS(o)
-          & (SCHEME_TOPLEVEL_CONST | SCHEME_TOPLEVEL_READY))
+      if (SCHEME_TOPLEVEL_FLAGS(o) & SCHEME_TOPLEVEL_FLAGS_MASK)
         return 1;
       else
         return 0;
@@ -242,8 +241,7 @@ int scheme_omittable_expr(Scheme_Object *o, int vals, int fuel, int resolved,
   if (vtype == scheme_compiled_toplevel_type) {
     note_match(1, vals, warn_info);
     if ((vals == 1) || (vals < 0)) {
-      if (SCHEME_TOPLEVEL_FLAGS(o)
-          & (SCHEME_TOPLEVEL_CONST | SCHEME_TOPLEVEL_READY))
+      if ((SCHEME_TOPLEVEL_FLAGS(o) & SCHEME_TOPLEVEL_FLAGS_MASK) >= SCHEME_TOPLEVEL_READY)
         return 1;
       else
         return 0;
@@ -3158,7 +3156,7 @@ int scheme_compiled_propagate_ok(Scheme_Object *value, Optimize_Info *info)
 
 
   if (SAME_TYPE(SCHEME_TYPE(value), scheme_compiled_toplevel_type)) {
-    if (SCHEME_TOPLEVEL_FLAGS(value) & SCHEME_TOPLEVEL_CONST)
+    if (SCHEME_TOPLEVEL_FLAGS(value) >= SCHEME_TOPLEVEL_FIXED)
       return 1;
     if (info->top_level_consts) {
       int pos;
@@ -4513,7 +4511,7 @@ module_optimize(Scheme_Object *data, Optimize_Info *info, int context)
   Scheme_Object *e, *vars, *old_context;
   int start_simltaneous = 0, i_m, cnt;
   Scheme_Object *cl_first = NULL, *cl_last = NULL;
-  Scheme_Hash_Table *consts = NULL, *ready_table = NULL, *re_consts = NULL;
+  Scheme_Hash_Table *consts = NULL, *fixed_table = NULL, *re_consts = NULL;
   int cont, next_pos_ready = -1, inline_fuel, is_proc_def;
 
   old_context = info->context;
@@ -4650,14 +4648,15 @@ module_optimize(Scheme_Object *data, Optimize_Info *info, int context)
               scheme_hash_set(re_consts, scheme_make_integer(i_m),
                               scheme_make_integer(pos));
 	    } else {
-	      /* At least mark it as ready */
-	      if (!ready_table) {
-		ready_table = scheme_make_hash_table(SCHEME_hash_ptr);
+	      /* At least mark it as fixed */
+              
+	      if (!fixed_table) {
+		fixed_table = scheme_make_hash_table(SCHEME_hash_ptr);
 		if (!consts)
 		  consts = scheme_make_hash_table(SCHEME_hash_ptr);
-		scheme_hash_set(consts, scheme_false, (Scheme_Object *)ready_table);
+		scheme_hash_set(consts, scheme_false, (Scheme_Object *)fixed_table);
 	      }
-	      scheme_hash_set(ready_table, scheme_make_integer(tl->position), scheme_true);
+	      scheme_hash_set(fixed_table, scheme_make_integer(tl->position), scheme_true);
 	    }
 	  }
 	} else {
@@ -4670,7 +4669,7 @@ module_optimize(Scheme_Object *data, Optimize_Info *info, int context)
 	  for (l = vars; !SCHEME_NULLP(l); l = SCHEME_CDR(l)) {
 	    a = SCHEME_CAR(l);
 
-	    /* Test for ISCONST to indicate no set!: */
+	    /* Test for set!: */
 	    if (!(SCHEME_TOPLEVEL_FLAGS(a) & SCHEME_TOPLEVEL_MUTATED)) {
 	      pos = SCHEME_TOPLEVEL_POS(a);
 
@@ -4794,13 +4793,13 @@ module_optimize(Scheme_Object *data, Optimize_Info *info, int context)
     }
 
     if (next_pos_ready > -1) {
-      if (!ready_table) {
-        ready_table = scheme_make_hash_table(SCHEME_hash_ptr);
+      if (!fixed_table) {
+        fixed_table = scheme_make_hash_table(SCHEME_hash_ptr);
         if (!consts)
           consts = scheme_make_hash_table(SCHEME_hash_ptr);
-        scheme_hash_set(consts, scheme_false, (Scheme_Object *)ready_table);
+        scheme_hash_set(consts, scheme_false, (Scheme_Object *)fixed_table);
       }
-      scheme_hash_set(ready_table, scheme_make_integer(next_pos_ready), scheme_true);
+      scheme_hash_set(fixed_table, scheme_make_integer(next_pos_ready), scheme_true);
       next_pos_ready = -1;
     }
   }
@@ -4979,9 +4978,9 @@ Scheme_Object *scheme_optimize_expr(Scheme_Object *expr, Optimize_Info *info, in
 	  c = scheme_hash_get((Scheme_Hash_Table *)c, scheme_make_integer(pos));
 
 	  if (c) {
-	    /* We can't inline, but mark the top level as ready,
-	       so we can avoid null checks in JITed code: */
-	    expr = scheme_toplevel_to_flagged_toplevel(expr, SCHEME_TOPLEVEL_READY);
+	    /* We can't inline, but mark the top level as ready and fixed,
+	       so we can avoid null checks in JITed code, etc: */
+	    expr = scheme_toplevel_to_flagged_toplevel(expr, SCHEME_TOPLEVEL_FIXED);
 	  }
 	}
         if (!c)
diff --git a/src/racket/src/resolve.c b/src/racket/src/resolve.c
index b26d96e62f..644912cc5d 100644
--- a/src/racket/src/resolve.c
+++ b/src/racket/src/resolve.c
@@ -578,14 +578,14 @@ define_values_resolve(Scheme_Object *data, Resolve_Info *rslv)
 
   /* If this is a module-level definition: for each variable, if the
      defined variable doesn't have SCHEME_TOPLEVEL_MUTATED, then
-     resolve to a top-level reference with SCHEME_TOPLEVEL_CONST, so
+     resolve to a top-level reference with SCHEME_TOPLEVEL_SEAL, so
      that we know to set GLOS_IS_IMMUTATED at run time. */
   for (l = vars; !SCHEME_NULLP(l); l = SCHEME_CDR(l)) {
     a = SCHEME_CAR(l);
     if (rslv->in_module
 	&& rslv->enforce_const
 	&& (!(SCHEME_TOPLEVEL_FLAGS(a) & SCHEME_TOPLEVEL_MUTATED))) {
-      a = scheme_toplevel_to_flagged_toplevel(a, SCHEME_TOPLEVEL_CONST);
+      a = scheme_toplevel_to_flagged_toplevel(a, SCHEME_TOPLEVEL_SEAL);
     }
     a = resolve_toplevel(rslv, a, 0);
     SCHEME_CAR(l) = a;
@@ -795,7 +795,8 @@ static int is_lifted_reference(Scheme_Object *v)
     return 1;
 
   return (SAME_TYPE(SCHEME_TYPE(v), scheme_toplevel_type)
-          && (SCHEME_TOPLEVEL_FLAGS(v) & SCHEME_TOPLEVEL_CONST));
+          && ((SCHEME_TOPLEVEL_FLAGS(v) & SCHEME_TOPLEVEL_FLAGS_MASK)
+              >= SCHEME_TOPLEVEL_CONST));
 }
 
 static int is_closed_reference(Scheme_Object *v)
@@ -2877,7 +2878,7 @@ static int resolve_quote_syntax_pos(Resolve_Info *info)
   return info->prefix->num_toplevels;
 }
 
-static Scheme_Object *resolve_toplevel(Resolve_Info *info, Scheme_Object *expr, int keep_ready)
+static Scheme_Object *resolve_toplevel(Resolve_Info *info, Scheme_Object *expr, int as_reference)
 {
   int skip, pos;
 
@@ -2890,10 +2891,7 @@ static Scheme_Object *resolve_toplevel(Resolve_Info *info, Scheme_Object *expr,
   return scheme_make_toplevel(skip + SCHEME_TOPLEVEL_DEPTH(expr), /* depth is 0 (normal) or 1 (exp-time) */
                               pos,
                               1,
-                              SCHEME_TOPLEVEL_FLAGS(expr) & (SCHEME_TOPLEVEL_CONST
-                                                             | (keep_ready 
-                                                                ? SCHEME_TOPLEVEL_READY
-                                                                : 0)));
+                              SCHEME_TOPLEVEL_FLAGS(expr) & SCHEME_TOPLEVEL_FLAGS_MASK);
 }
 
 static Scheme_Object *shift_toplevel(Scheme_Object *expr, int delta)
diff --git a/src/racket/src/schpriv.h b/src/racket/src/schpriv.h
index b8c7af9c0e..b6bd7b94fd 100644
--- a/src/racket/src/schpriv.h
+++ b/src/racket/src/schpriv.h
@@ -420,6 +420,10 @@ extern Scheme_Object *scheme_no_arity_property;
 
 extern Scheme_Object *scheme_reduced_procedure_struct;
 
+/* recycle some constants that can't appear in code: */
+#define scheme_constant_key scheme_stack_dump_key
+#define scheme_fixed_key    scheme_default_prompt_tag
+
 /*========================================================================*/
 /*                    thread state and maintenance                        */
 /*========================================================================*/
@@ -1222,8 +1226,28 @@ typedef struct Scheme_Toplevel {
 #define SCHEME_TOPLEVEL_POS(obj)    (((Scheme_Toplevel *)(obj))->position)
 #define SCHEME_TOPLEVEL_FLAGS(obj)  MZ_OPT_HASH_KEY(&((Scheme_Toplevel *)(obj))->iso)
 
-#define SCHEME_TOPLEVEL_CONST   0x1
-#define SCHEME_TOPLEVEL_READY   0x2
+/* The MASK pull out one of the levels for reference (CONST,
+   FIXED, READY, or UNKNOWN) or one of the two levels for a
+   reference (SEAL or not) */
+#define SCHEME_TOPLEVEL_FLAGS_MASK 0x3
+
+/* CONST means that a toplevel is READY and always has the same value,
+   even for different instantiations or phases. */
+#define SCHEME_TOPLEVEL_CONST   3
+/* FIXED is READY plus a promise of no mutation, but the value is
+   not necessarily constant across different instantations or phases. */
+#define SCHEME_TOPLEVEL_FIXED   2
+/* READY means that the toplevel will have a value (i.e., the variable
+   is defined), though it might be mutated later */
+#define SCHEME_TOPLEVEL_READY   1
+/* UNKNOWN means that the variable might not even be defined by the time the
+   toplevel reference is executed */
+#define SCHEME_TOPLEVEL_UNKNOWN   0
+
+#define SCHEME_TOPLEVEL_SEAL   0x1
+
+/* MUTATED is used on the toplevel for a definition, and only until
+   after resolving; it records whether a toplevel is `set!'ed */
 #define SCHEME_TOPLEVEL_MUTATED 0x4
 
 typedef struct Scheme_Quote_Syntax {
@@ -2374,7 +2398,6 @@ Scheme_Object *scheme_make_toplevel(mzshort depth, int position, int resolved, i
 
 #define MAX_CONST_TOPLEVEL_DEPTH 16
 #define MAX_CONST_TOPLEVEL_POS 16
-#define SCHEME_TOPLEVEL_FLAGS_MASK 0x3
 
 #define ASSERT_IS_VARIABLE_BUCKET(b) /* if (((Scheme_Object *)b)->type != scheme_variable_type) abort() */
 
@@ -3046,13 +3069,17 @@ typedef struct Scheme_Modidx {
 } Scheme_Modidx;
 
 typedef struct Module_Variable {
-  Scheme_Inclhash_Object iso; /* 0x1 flag => constant */
+  Scheme_Inclhash_Object iso; /* see SCHEME_MODVAR_... flags */
   Scheme_Object *modidx;
   Scheme_Object *sym;
   Scheme_Object *insp; /* for checking protected/unexported access */
   int pos, mod_phase;
 } Module_Variable;
 
+/* See SCHEME_TOPLEVEL_...: */
+#define SCHEME_MODVAR_CONST 0x1
+#define SCHEME_MODVAR_FIXED 0x2
+
 #define SCHEME_MODVAR_FLAGS(pr) MZ_OPT_HASH_KEY(&((Module_Variable *)pr)->iso)
 
 #define SCHEME_VARREF_FLAGS(pr) MZ_OPT_HASH_KEY(&((Scheme_Simple_Object *)pr)->iso)
diff --git a/src/racket/src/schvers.h b/src/racket/src/schvers.h
index f66e9d5d80..b5cfd8cdc5 100644
--- a/src/racket/src/schvers.h
+++ b/src/racket/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "5.1.3.1"
+#define MZSCHEME_VERSION "5.1.3.2"
 
 #define MZSCHEME_VERSION_X 5
 #define MZSCHEME_VERSION_Y 1
 #define MZSCHEME_VERSION_Z 3
-#define MZSCHEME_VERSION_W 1
+#define MZSCHEME_VERSION_W 2
 
 #define MZSCHEME_VERSION_MAJOR ((MZSCHEME_VERSION_X * 100) + MZSCHEME_VERSION_Y)
 #define MZSCHEME_VERSION_MINOR ((MZSCHEME_VERSION_Z * 1000) + MZSCHEME_VERSION_W)