When we were indirectly using CLDR UnicodeProperty, I made some improvements, intended to be performance optimizations for getting a UnicodeSet for the property=yes mappings:

• https://github.com/unicode-org/cldr/pull/208/files#diff-55a84a7b970cb77290ac491e3ded85516f1d017374084b06b773d9a113adb7f6

Recover those into the unicodetools UnicodeProperty.

See issue #66 and pull request #219.

meld ~/cldr/uni/src/tools/cldr-code/src/main/java/org/unicode/cldr/util/props/UnicodeProperty.java unicodetools/src/main/java/org/unicode/props/UnicodeProperty.java