Is this documented anywhere?
Yes, in sv.c in the perl source ("use the source, luke" ;-)
Line 1680 ff:
/*
=for apidoc looks_like_number
Test if the content of an SV looks like a number (or is a number).
C<Inf> and C<Infinity> are treated as numbers (so will not issue a
non-numeric warning), even if your atof() doesn't grok them.
=cut
*/
and so - suprise! - perlapi tells the same.
Read through sv.c to see what happens. The perl5 spec is coherent with its implementation ;-)
--shmem
_($_=" "x(1<<5)."?\n".q·/)Oo. G°\ /
/\_¯/(q /
---------------------------- \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}
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