[HashTreeCollections] Add TreeDictionary.combining(_:by:)
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lorentey
added
the
HashTreeCollections
Spin off two separate combining behaviors for values that are present in both dictionaries, based on whether or not the values are equal. Before this change, unequal values were always merged, which isn’t necessarily what we want.
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Rescheduling to 1.2. |
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This adds an elaborate new entry point for structurally combining two
TreeDictionaryinstances, complete with a deeply customizable element-wise combining strategy.This PR is a proof of concept that may turn into a shipping feature. It currently builds, but it has not yet seen any testing whatsoever. The new APIs currently require Swift 5.7 or better, as they use primary associated types.
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