4dfe0fa068
As shown in the tests, `KeyValuePipe.transform` can accept `undefined`, in which case it always returns `null`. Additionally, the typing for `string` keys can be made generic, so the comparison function is only required to accept the relevant cases. Finally, the typing for `number` records now shows that the comparison function and the result entries will actually receive the string version of the numeric keys, just as shown in the tests. BREAKING CHANGE: The typing of the `keyvalue` pipe has been fixed to report that for input objects that have `number` keys, the result will contain the string representation of the keys. This was already the case and the code has simply been updated to reflect this. Please update the consumers of the pipe output if they were relying on the incorrect types. Note that this does not affect use cases where the input values are `Map`s, so if you need to preserve `number`s, this is an effective way. PR Close #37447
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