Unzip Map and IntMap more efficiently #164
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The previous `Map` (same for `IntMap` throughout) instance would first map eagerly over tha `Map`, producing an entire `Map` full of thunks to apply the `unzipWith` function. Then it would build two more entire `Map`s full of thunks to select components of each pair. Depending on inlining and such, the resulting maps may or may not have contained selector thunks; if not, they could leak memory. Fix that. NOTE: This PR is an alternative to haskellari#163. This one preserves the precise laziness properties of the previous implementation.
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The previous
Map(same forIntMapthroughout) instancewould first map eagerly over tha
Map, producing an entireMapfull of thunks to apply theunzipWithfunction. Thenit would build two more entire
Maps full of thunks to selectcomponents of each pair. Depending on inlining and such, the
resulting maps may or may not have contained selector thunks;
if not, they could leak memory. Fix that.
NOTE: This PR is an alternative to #163. This one preserves
the precise laziness properties of the previous implementation.