heard we have subroutine signature support in perl5.20. if so can you point me to the man pages for that ?

https://metacpan.org/pod/distribution/perl/pod/perl5200delta.pod#Experimental-Subroutine-signatures

https://metacpan.org/pod/perlsub#Signatures

Sub::Signatures, Sub::MicroSig, Sub::NamedParams/Params::Named/Method::Signatures...

perldeltas - every perl*delta in one file with each version properly linkable .