Apologies if I'm misunderstanding something here, but isn't the following code assigning to a glob?

*{$package . "::" . $name} = sub :lvalue {
[download]

True, but that wasn't what I was referring to. The above is only executed once. The concern was with the following line in the original code that was executed every time the method was called:

local *call = sub { $self->{$name}->(@_); };
[download]

By removing that line, my suggested code should not suffer from the method cache reset performance penalty that occurs each time the method in the original code is called.