in reply to
how to avoid mis-spelling hash keys?
Pre perl 5.8 you can use Tie::Hash::FixedKeys by davorg. It has exactly the functionality you ask for with the drawback of using the tie mechanism which implies a decrease in performance.
I make decisions, and my brain carries them out
My brain makes the decisions, and I observe them (if I'm lucky)
I make some decisions, and my brain makes others
My spouse makes decisions and I and my brain carry them out
I wrote a program to relieve me and my brain from the burden of decision-making
The black-helicopter people project the decisions into my brain and then I do as ordered
Results (485 votes),