Binary insertion sort #3
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Also expose an auxiliary function which is going to be useful for TimSort and cie.
[Array.blit t ofs t (ofs + 1) len] uses memmove under the hood which allocates a temporary array, this is terrible in terms of performance.
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This is meant to be used for sorting small arrays.
I think (?) I fully specified the behaviour of both functions but a second look is more than welcome