A library for implementing equals and hashCode

[Liam Miller-Cushon]

Please consider this proposal for a library to help implement equals and
hashCode.

The doc includes a discussion of the motivation for adding such an API to
the JDK, a map of the design space, and some thoughts on the subset of that
space which might be most interesting:

http://cr.openjdk.java.net/~cushon/amber/equivalence.html