COMMIT Spec to ensure IO#readpartial works with multibyte characters. Closes #41.	http://github.com/rubyspec/rubyspec/commit/4481fe99933f65e909330445cff2956625c0c822

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+++ 20110210T022207Z
@@ 14953 @@
 - raises IOError on closed stream
 - reads at most the specified number of bytes
 - reads after ungetc with data in the buffer
+- reads after ungetc with multibyte characters in the buffer
 - reads after ungetc without data in the buffer
 - discards the existing buffer content upon successful read
 - raises EOFError on EOF
@@ 47259 @@
 - raises IOError on closed stream
 - reads at most the specified number of bytes
 - reads after ungetc with data in the buffer
+- reads after ungetc with multibyte characters in the buffer
 - reads after ungetc without data in the buffer
 - discards the existing buffer content upon successful read
 - raises EOFError on EOF