alhudz opened a new pull request, #1728:
URL: https://github.com/apache/commons-lang/pull/1728
Repro: capitalise any word that begins with a supplementary cased letter,
e.g. `WordUtils.capitalize("𐐨bc")` where `𐐨` is Deseret small long-i `U+10428`.
Cause: `capitalize`, `capitalizeFully`, `uncapitalize` and `swapCase`
iterate one `char` at a time and call
`Character.toTitleCase`/`toUpperCase`/`toLowerCase` on each unit. The two
surrogate halves of a supplementary code point carry no case mapping, so the
letter is left as-is and the result diverges from
`StringUtils.capitalize`/`swapCase`, which already work on code points
(`capitalize` yields `U+10428` instead of `U+10400`, `swapCase` leaves
`U+10400` unchanged).
Fix: iterate with `Character.codePointAt` and write the mapped code point
back with `Character.toChars`. A case mapping never changes the UTF-16 length,
so the existing buffer is reused; BMP input and lone surrogates are untouched.
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