The release announcement sketch that I have so far is below. Please
mail me new items and/or edits.
Please phrase announcements using complete sentences and avoid the
word "now”.
(Because of the late date, I’m hoping to hear any response you might have by
Noon EDT tomorrow; the 7.4 release is bundled and ready to go. I apologize
for not sending this proposed announcement out earlier. — JBC)
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With this 7.4 release, we are making Racket CS available, a beta version
of the Racket on Chez Scheme implementation. Racket CS is "beta"
quality for the v7.4 release. It works well enough to be worth trying,
but there are likely too many lingering problems for a project to switch
to Racket CS for production use at this time. We encourage you to kick
the tires of the new CS releases, and to help push this project forward
by reporting any problems that you find.
- Racket CS is available as a download option. To download Racket CS,
select "CS (beta)" instead of "regular" from the "Variant" popup menu.
- Single-precision floating-point literals, a.k.a. single-flonums, are
no longer supported by default.
This is a backward-incompatible change, but the use of single-flonums
appears to be rare. Since Racket CS does not support single-flonums,
disabling single-flonums by default smooths the transition from regular
Racket and Racket CS.
The `read-single-flonum` parameter can be set to #t to enable reading
single-flonum literals, but a better strategy in most cases is to use
`real->single-flonum` when `single-flonum-available?` reports #t or
when `single-flonum?` reports #t for a value (which implies that
single-flonums must be supported). Where single-flonums are supported,
Racket's compiler will fold a call of `real->single-flonum` on a
literal number to a constant single-flonum value.
- New compilation flags including --disable-generations and --enable-ubsan
provide better support for alternative architectures.
- The 2htdp/universe teachpack supports an event log window for big-bang.
With this option, students can inspect the events that big-bang handled,
plus their payload. The event log includes messages from external
sources.
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