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Remove Joining_Group numeric constants from UCD_Types #967

Closed eggrobin closed 1 week ago

eggrobin commented 1 week ago

Recently discussed in https://github.com/unicode-org/unicodetools/pull/756#discussion_r1842413362.

UCD_Types is part of the most ancient layers of these tools: https://github.com/unicode-org/unicodetools/blob/6da68627c20dafcdc3e16c2f67196fa45d4cf83d/unicodetools/src/main/java/org/unicode/text/UCD/UCD_Types.java#L2-L3

It is only used in very limited contexts by the more recent strata which generate and parse the bulk of the UCD.

In particular, these constants are not used, and they are annoying to maintain (especially when merging independent proposals).