lenamonj commented on PR #443:
URL: https://github.com/apache/commons-codec/pull/443#issuecomment-5654869305

   `getBytes(UTF_8)` turns a lone surrogate into `?`, so a name holding one 
shared its sort key with `?` and the `TreeSet` kept only one of them; 
`compareTo` now falls back to the `String` order when the bytes tie, which 
keeps both as the `String` comparator did, and never fires for well-formed 
names, whose UTF-8 encoding is unique; 
`testTreeIdKeepsNamesWithTheSameUtf8Bytes` covers it. Both Javadoc sentences 
are reworded. Two such names still serialize to the same byte, and `git 
hash-object -t tree -w` refuses that tree with `duplicateEntries`, so rejecting 
names UTF-8 cannot encode would stop `treeId` from hashing a tree git cannot 
store; that changes what it accepts, so it is not in this change unless you 
want it.
   


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