- build the sub projections only once and build them before getting
the blame objects (instead of after getting the actual values)
- added context information to the blame objects
- added an optional #:min-count argument to insist on a minimum length
for the stream
related to PR 13709
conventions in 9.2.1 of the reference (altho the messages do
not yet do the extra level of indenting when a field is too
long, nor are there any field names ending in ...)
Also, fix the docs for the #:stronger argument to
make-contract, make-chaperone-contract, and make-flat-contract
change the implementation to special case struct procedures and to use
it in provide/contract.
This speeds up the rendering phase of the Guide documentation by more than 2x.
Thanks to Matthew for spotting the opportunity!
