[Haskell-cafe] mutable arrays of tuples

[David Feuer]

So I was thinking about a mutable array of tuples, but to avoid allocating
tuples to modify their fields, I guess I really want an immutable array of
tuples of STRefs. Just how much less efficient is this than a plain mutable
array? might it even make sense to use parallel mutable arrays? The thought
of that is disgusting to me, but at least one of the arrays could likely be
made unboxed...
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