in reply to Re^4: How best to validate the keys of hashref arguments?
in thread How best to validate the keys of hashref arguments?

Yes it does, so does this:

%$new_cmd = %$init_hash;

Of course both assume I'm never gonna want to nest other hashrefs in my commands and initializers. I'm not, right? No. Never. Of course not ....

Right. Ok, I'm going to use Clone.