What language to use for implementation

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I'm hesitant to use Python because it would be more transparent and thus easier to understand what was actually happening in the code in the transpiled C++ and because last I checked Python still has global interpreter lock issues.

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I recently found out that the GIL isn’t an issue for most numpy operations

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The GIL is eventually going away but not any time soon: https://superfastpython.com/gil-removed-from-python/