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Lazy I/O conflates evaluation with execution; a
value obtained from unsafeInterleaveIO can
perform side-effects during the evaluation of
pure code. Like lazy I/O, a Sink provides a way
to obtain the value of the result of an IO
action before the action has been executed, but
unlike lazy I/O, it does not enable pure code to
perform side-effects. Instead, the value is
explicitly assigned by a later IO action.