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If we don't want to introduce an unsafe operation, we might discuss introducing compound keys as an alternative.

CompoundKey<HComposite<H, T>P> consists of a head and a postfix, and the partition of a compound key is always defined by its 'head' only.

Also, k and CompoundKeyCompositeKey(k, v) must have the same partition for each k.

CompoundKey CompositeKey usage will be safe both from pov of data locality and IQ, however it is questionable, whether it will be convenient to use it.