Don't high performance systems have heuristics to decide what specific algorithms to use at runtime? It is not unimaginable to think that there could be a funct

Don't high performance systems have heuristics to decide what specific algorithms to use at runtime? It is not unimaginable to think that there could be a function dedicated to small vs large collections. Assuming the results hold, someone has to decide if the additional complexity is worth the performance. For something like BLAS, go nuts. For Python standard library, maybe not.