Richard van der Hoff c0df6bae06 Remove keylen from LruCache. (#9993) ...

`keylen` seems to be a thing that is frequently incorrectly set, and we don't really need it.

The only time it was used was to figure out if we had removed a subtree in `del_multi`, which we can do better by changing `TreeCache.pop` to return a different type (`TreeCacheNode`).

Commits should be independently reviewable.

2021-05-24 14:02:01 +01:00

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