RC6 is a significant performance tuning step for the most part. Code
controlling floating-point exception handling has also been entirely
reworked. The --enable-unicode option is now working again but is still off
by default and remains experimental.
The performance difficulties were considered serious enough to postpone the
completion of the 1.0.0 release process.
There will be one last release candidate (7) before final release. It will
complete the performance tuning, fix a few minor
issues in slime and be a general opportunity to clean-up the source code.
