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Please add find_equiv to TreeMap #14549

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@SimonSapin

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@SimonSapin

For accessing a key in a JSON object (which is represented in memory as TreeMap<String, Json>), I find myself writing code like map.find(&key.to_string()) that really should be just map.find(key).

HashMap has a find_equiv method to do this. It’d be nice to have it in TreeMap. (Other convenience method may apply to.)

However, you may want to block this on a decision from #12135.

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