It's "its."
merging from ruby trunk
Merge pull request #17 from mjtko/a589cb7a503c7e3761ab4dff0ed10597beffdd05

Fixes a memory leak in Psych parser
Merge pull request #15 from nirvdrum/patch-1

Small grammar fix for Readme.
ruby classes can round trip
adding module serialization support
fixing Hash subclass dump and load support. fixes #14
bumping version and copying changelog from ruby core
merge from ruby trunk
avoid ruby warnings
fixing cyclic object reference handling. Thanks to @CvX for the test.  fixes #19
sync with ruby trunk
syncing with ruby trunk
* ext/psych/lib/psych/nodes/node.rb: default `to_yaml` encoding to be
  UTF-8.
* test/psych/test_encoding.rb: test yaml dump encoding.
bumping version number
add a test to munge the spec for inclusion in ruby-trunk
sync with ruby-trunk
Strings tagged binary will be emitted as binary. Fixes #27
1.9.2 compatibility
rc1