garydgregory opened a new pull request, #1638:
URL: https://github.com/apache/commons-lang/pull/1638

   Two fixes in RandomStringUtils.random(int, int, int, boolean, boolean, 
char[], Random)
   
   - A custom chars array throws IllegalArgumentException because validation 
loops treat the loop index as a char code point instead of an index into the 
chars array.
   - random() hangs when the specified [start, end) range contains ONLY 
rejected code points (UNASSIGNED, PRIVATE_USE, SURROGATE). The loop increments 
count and retries indefinitely.
   
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Commons](https://commons.apache.org/)! Your help is appreciated!
   
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