Roberto Ierusalimschy b0810c51c3 Small optimizations in 'string.gsub' ...

Avoid creating extra strings when possible:

- avoid creating new resulting string when subject was not modified
(instead, return the subject itself);

- avoid creating strings representing the captured substrings when
handling replacements like '%1' (instead, add the substring directly
to the buffer).

2019-04-11 11:29:16 -03:00

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