Are the faster versions of HashMap and BigInteger going into jdk7?

[Paulo Levi]

I don't think it's the same. 6622432 appears to be programming
optimizations for the existing BigInteger. Alan Eliasen version is one
that uses lower complexity algorithms for the larger numbers.

If hashmap is replaced by a more efficient version, that would be
probably a massive win in some real world programs. The entries
apparently are a hotspot for the gc in some utilizations of hashmap.