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"The problem is that the Python API can only produce one number per call and a function call in Python is really slow (it creates a Python frame). If you want to speed it Python, it would be better to add methods to generate arrays to limit the overhead of Python function calls."
That is why I suggested an option to return a raw buffer (e.g. bytearray or memory_view). 
My experience with NumPy and MATLAB tells me that random numbers are nearly always needed in arrays with scripting languages.
But I cannot focus my thoughts...