And now you have strayed so far from where this started it would be meaningless to continue to respond to you.
Nothing in the OP suggests that he is dealing with data received from untrusted sources. NOTHING!
And everything you have said that is founded upon that premise is meaningless in the context of the OP and my response.
In reply to Re^9: Can't use an undefined value as a HASH reference
by BrowserUk
in thread Can't use an undefined value as a HASH reference
by Anonymous Monk
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