[racket-dev] Generics update

I just pushed some of my work on generics in response to the mailing list
thread about define/generic.  What I pushed includes:

- define-generics now takes keyword arguments in any order, and allows them
before and/or after the method declarations
- #:defaults now works exactly like #:methods; it allows define/generic and
unsupported (absent) methods
- there is now a #:fallbacks option for define-generics

Carl Eastlund
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