Hi!
imo the patch is consistent with how substr works: tyrael@thor:~$ php -d display_errors=1 -d error_reporting=-1 -r 'echo substr("prefix_num", -100);' prefix_numMaybe, but I would classify *that* as a bug as it makes no sense at all.
It makes some sense, if you take the meaning of argument as "at most 100 characters". I'm not sure how useful it'd be backwards, but forward something like "at most 100 chars" is very useful and warning, on the contrary, in such situation would be useless and annoying. Why not make backwards case symmetrical?
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