severely restrict named-to-positional binding
severely restrict named-to-positional binding

Binding named args to positional parameters is now restricted to
explicit C<proto> and C<only> declarations.  But we will support it,
since it can have profound refactoring advantages if you don't have
to know which parameters will eventually end up as positionals.

perl6/specs,tokuhirom/specs,perl6/specs,prammer/specs,prammer/specs,tokuhirom/specs,tokuhirom/specs,prammer/specs