Added `array_permutations` (attempt 2)#1014

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ronnodas:array-permutations

Commits on Jan 9, 2025

Treat k==0 less special

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Treat k==0 less special (2)

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Introduce MaybeConstSize

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PoolIndex<T> -> PoolIndex

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MaybeConstSize (2)

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Express some things via PoolIndex/MaybeConstUsize

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Try to use PoolIndex for permutations

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Commits on Jan 16, 2025