Ugh, tell me about it. After trying out Method::Signatures on my Linux partition (like you said, the installation was seamless), I just can't go back to the old way of unpacking/validating arguments, which is quite problematic since I also use Windows and OSX. Installing it on cygwin turns out to be the hardest of them all.

Anyway, as a way of saying thanks, if you are a perltidy user you should check out Perl::Tidy::Sweetened which understands the method and func keywords exported by Method::Signatures.