Potential improvement of piecewise #24
Description
For our reference: numpy's piecewise implementation https://github.com/numpy/numpy/blob/v1.20.0/numpy/lib/function_base.py#L500-L618
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For our reference: numpy's piecewise implementation https://github.com/numpy/numpy/blob/v1.20.0/numpy/lib/function_base.py#L500-L618