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(1) normalize_indices in _mcp.pyx should convert indices to ints: fixed (2) huge (order of magnitude) performance problems in heap.pyx from changing lines like: ii = (i-1)/2 # CalcPrevAbs to: ii = (int)(i-1)/2 # CalcPrevAbs for some reason, the latter goes through the python division machinery! However, the former is invalid for cython >=0.12, so the proper solution is: ii = (i-1)//2 # CalcPrevAbs