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In many places, 'splitUniqSupply' + 'uniqFromSupply' is used to split a UniqSupply into a Unique and a new UniqSupply. In such places we should instead use the more efficient and more appropriate 'takeUniqFromSupply' (or equivalent). Not only is the former method slower, it also generates and throws away an extra Unique. Signed-off-by: Austin Seipp <aseipp@pobox.com>
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