Is there a roundup of what's in this other than the GC fix on symbols? Or is that the only change of note?
Fix dependencies to make bigdecimal installable by rubygems
some updates to rb_hash_delete
"restrict searching case-insensitive name from the filesystem to only last part, for the performance"
file.c (rb_file_expand_path_internal): drop characters ignored by filesystem on Mac OS X.
A GC fix on Solaris
" DNS is case-insensitive, so the comparison should be case-insensitive as well"
Some other OS specific fixes
Misc