I don't know for sure, but I wouldn't mind betting that it has to do with the traditional overheads associated with the use of hashes - in this case, hash lookup c/w direct code.
As I say I don't know, but a pound to a pinch of sh!t that one of the more learned brethren will put me (rightfully) in my place.
I should have realised from my initial observation that the difference could be at least in part put down to the difference between run-time and compile-time machinations ... as since pointed out elsewhere.
A user level that continues to overstate my experience :-))
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