4 ms·If checks are in the libc functions. (a guess, didn't look at the source)by fctorial 6y agoIf checks are in the libc functions. (a guess, didn't look at the source)StavrosK 6y agoIt's more of a composite header (ELF/PE/etc) like those "it's both a JPG and a zip" things", though.fctorial 6y agoYes, that too.