Github user reudismam commented on the issue:
https://github.com/apache/ant/pull/62
Actually, I do not have a documentation, but there are discussions in
programming community about the benefits of this change, such as this:
[https://stackoverflow.com/questions/24859500/concatenate-char-literal-x-vs-single-char-string-literal-x](https://stackoverflow.com/questions/24859500/concatenate-char-literal-x-vs-single-char-string-literal-x)
This edit is known to have improved performance on other projects such as
Guava Project where they improve performance from 10-25%.
[https://stackoverflow.com/questions/24859500/concatenate-char-literal-x-vs-single-char-string-literal-x](https://github.com/google/guava/commit/8f48177132547cee2943c93837d76b898154d722)
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