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> If I'm following correctly, code that uses t[k] = nil to clean up
> parts of a table would behave the same, but take up more memory,
> unless modified to use table.delete() ?

Currently, t[k] = nil does not clean up anything, so that would not be
a big difference. (OK, t[k]=nil opens the door for a future clean up,
but that depends on other things; I guess few programs actually go
to the stage of a clean up...)

Much more serious, for me, is the incompatibility that t[#t] = nil will
not "pop" elements form a list (and. of course, the extra complexity).

-- Roberto