I was worried about even posting the reply because I haven't a good story for why it should work apart from Perl DWIMery. As you point out it's not documented as providing that behaviour in any obvious place.
On the other hand it would break a huge amount of code should that behaviour change so I'd guess it ought be safe enough to use.
In reply to Re^3: How should named paramater keys be named?
by GrandFather
in thread How should named paramater keys be named?
by davido
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