(1.) is not entirely true. I did test 3-level hash with approximately 20 keys per level. I did try to clone the whole thing, only two level slice and finally 1 level leaf. here are results:
1level "leaf" hash: Clone is twice as fast as dclone
2level hash: dclone is a slightly faster (assume the same)
whole 3level hash: both are nearly the same (very slight ~1% advantage to Clone)
everyone can setup own test but I think Clone has slight advantage only for very small structures.
I would go with dclone.
my 2c :)
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