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Perl_sv_vcatpvfn_flags: do %p specials in %p case
There are currently a few special-cased %p variants (but only when called
from C, not from perl) such as %-p, %2p etc. Currently these are handled
specially at the top of main format-element loop, which penalises every
format type. Instead move the handling into the "case 'p'" branch of the
main switch. Which seems more logical, as well as more efficient.
I've also heavily rewritten the big comment block about all the special %p
formats.
https://perl5.git.perl.org / perl5.git / commit