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I wonder if we should not remove the "hiraganaQuaternary" UCA collation option, as it seemed to be an implementation-specific hack (and has in the meanwhile been marked as deprecated) in the ICU standard implementation: http://sourceforge.net/p/icu/mailman/message/29475625/ http://icu-project.org/apiref/icu4j/com/ibm/icu/text/RuleBasedCollator.html#setHiraganaQuaternary(boolean)
Indeed, in the 2014-09-17 edition of TR35 (LDML), hiraganaQuaternary has become deprecated so we should drop it. I was reluctant to do this based solely on the ICU implementation, but as it's now deprecated at the Unicode level, it should definitely go.
At the F2F the meeting agreed; the document change log should note that the collation was dropped in response to a Last Call comment. Thanks!