[racket-dev] Optional equality predicate for assoc and member

I would like to look closely at this. Can you send me a patch?

At Fri, 22 Apr 2011 16:26:42 -0400, Vincent St-Amour wrote:
> Currently, unlike remove and remove-duplicates, assoc and member
> cannot use a user-provided equality check. I have a patch that fixes
> that by adding an optional argument to these two functions.
> 
> With this patch, assoc and member are implemented in Racket. They are
> currently implemented in C. I haven't measured the performance impact
> of the change, but I can do it if someone believes it's necessary.
> 
> Is anyone opposed to this change?
> 
> Vincent