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由 Jason Malinowski 提交于
Since ImmutableDictionary and ImmutableSortedDictionary are both implemented via trees; you can think of an ImmutableDictionary as just being a sorted dictionary where the underlying key is the hash int. Since our hash is just a hash of a GUID, we can compare by the GUID, switch to a ImmutableSortedDictionary, and then avoid another sort when we're computing checksums.
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