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af0839f911
Starting with Unicode 15, the provided DerivedBidiClass data file reports different default values to use for unassigned characters in different groups. Process the additional hints for that specific file, and allow overriding the values later if more specific. Since that was previously forbidden, change get_other_case() to report when no valid value could be provided and allow skipping conflicting rule lines that required that restriction. While at it, Allow using the long identifiers in `ucptest` with the `find bidi` command (underscores also allowed).