From 1f3a18d63763e8d9bab30792f44e26cff5ad3bc3 Mon Sep 17 00:00:00 2001
From: Sancho McCann <sanchom@gmail.com>
Date: Mon, 8 Jun 2020 06:35:58 -0700
Subject: [PATCH] Updated sgn documentation to reveal behaviour for signed
 zeros

Include expanded example set to show behaviour for infs
---
 pkgs/racket-doc/scribblings/reference/numbers.scrbl | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pkgs/racket-doc/scribblings/reference/numbers.scrbl b/pkgs/racket-doc/scribblings/reference/numbers.scrbl
index 30927d0061..e32b81f551 100644
--- a/pkgs/racket-doc/scribblings/reference/numbers.scrbl
+++ b/pkgs/racket-doc/scribblings/reference/numbers.scrbl
@@ -1293,15 +1293,19 @@ Returns @racket[(* z z)].}
 
 @defproc[(sgn [x real?]) (or/c (=/c -1) (=/c 0) (=/c 1) +nan.0 @#,racketvalfont{+nan.f})]{
 
-Returns the sign of @racket[x] as either @math{-1}, @math{0},
-@math{1}, or not-a-number.
+Returns the sign of @racket[x] as either @math{-1}, @math{0} (or a signed-zero variant, when
+inexact), @math{1}, or not-a-number.
 
 @mz-examples[
 #:eval math-eval
 (sgn 10)
 (sgn -10.0)
 (sgn 0)
+(sgn -0.0)
+(sgn +0.0)
 (sgn +nan.0)
+(sgn +inf.0)
+(sgn -inf.0)
 ]}
 
 @defproc[(conjugate [z number?]) number?]{