Fix presortedDecodedMap to only copy sourcemap fields #15
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Before, the presorted map would incorrectly copy over fields such as `_decodedMemo`, which fooled the duck-typing early return optimization. That would allow invalid `_encoded` state to be preserved, even if I explicitly set the map's `mappings` to a decoded segments array.
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Before, the presorted map would incorrectly copy over fields such as
_decodedMemo, which fooled the duck-typing early return optimization. That would allow invalid_encodedstate to be preserved, even if I explicitly set the map'smappingsto a decoded segments array.Fixes jestjs/jest#12998