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".
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* Racket CS supports faster exact-rational arithmetic.
* Racket has improved support for layered and tethered installation.
* Racket CS supports nonatomic allocation via ffi/unsave.
* The `raco cross` tool improves support for cross-compilation.
* DrRacket has performance improvements when editing files with
picts containing large bitmaps.
* Typed Racket more consistently refines field types of non-polymorphic structs.
* Typed Racket moves existential handling to return types.
* Typed Racket propagates control-flow refinements for let-values and
letrec-values.
* Printing of values is unified across the teaching language implementations
and the stepper.
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