alhudz commented on PR #1725:
URL: https://github.com/apache/commons-lang/pull/1725#issuecomment-4782116569

   Makes sense, that's the right framing. I've gated the supplementary fold on 
`SystemUtils.IS_JAVA_1_8`, so the non-String path now mirrors 
`String#regionMatches` on whatever JDK is running: Java 9+ folds the whole code 
point, Java 8 stays char-by-char and returns `false` the same way its own 
`String` does. Passing a `String`, `StringBuilder`, `StringBuffer` or 
`CharBuffer` to `CSU` now comes out the same on a given JDK, and matches 
calling `String` directly.
   
   For the tests I drive the supplementary rows off the running JDK's `String` 
result rather than a fixed boolean, and assert `String`, `StringBuilder`, 
`StringBuffer` and `CharBuffer` all agree with it, so they're green on 8 
through 25 instead of only on 9+. `TEST_DATA` keeps the BMP rows that read the 
same everywhere.
   
   Happy to look at `org.apache.commons.codec.binary.CharSequenceUtils` for the 
same thing once this one lands.


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