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Fix UTF8Util rejecting valid non-BMP characters, accepting lone surrogates - #318
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…gates isSurrogatePair returns true for valid pairs, but the code treated it as failure. Validate unpaired surrogates instead, including leading low and trailing high surrogates. Fixes apache#287
popduke
approved these changes
Nov 2, 2026
This was referenced Nov 2, 2026
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Summary
Character.isSurrogatePairis true for valid pairs, but the code treated it as failure: emoji and CJK Extension B+ were rejected while lone surrogates were accepted.Fix
UTF8UtilTest.mustNotCharswhich asserted the wrong behavior.Fixes #287
Verification
./mvnw -pl bifromq-util -am test -Dtest=UTF8UtilTest,TopicUtilsTest: 13 tests, 0 failures.