[plt-scheme] equal? for native extension types [patch]

At Tue, 13 Feb 2007 19:29:01 -0500 (EST), Dimitris Vyzovitis wrote:
> The attached patch adds "scheme_set_type_equalp" to allow extensions to
> register per-type equality functions and extends scheme_equal to treat
> them accordingly. It applies against svn revision 5592.

Thanks. I'll fold this in soon, but I'll have to extend it a bit first:
you need to extend the `equal-hash-code' function whenever you extend
`equal?'.

Matthew