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Some preliminary testing show that select-keys can be almost twice as fast if it were rewritten to use a transient map rather than a proper map as it does today.

In order to do so, select-keys would need to move to after where transient and its friends are defined.

If there is any interest in pursuing this, I'd be happy to provide a problem statement, more data on the performance, a couple of possible solutions, and perhaps ultimately a patch.

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Getting too old. I even tried to search both here and in jira, but to no avail.