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Summary
I accidentally set linewidth as'2' instead of 2 and the resulting error message is of no help:
[/usr/local/lib/python3.11/dist-packages/matplotlib/backends/backend_agg.py](https://localhost:8080/#) in draw_path(self, gc, path, transform, rgbFace)128else:129try:--> 130 self._renderer.draw_path(gc, path, transform, rgbFace)131exceptOverflowError:132 cant_chunk=''RuntimeError:Unable to cast Python instance of type <class 'tuple'> to C++ type '?' (#define PYBIND11_DETAILED_ERROR_MESSAGES or compile in debug mode for details)
Proposed fix
Other parameters like color get validated real time, so if it's not too expensive I think validating that linewidth is a number could save some debugging frustration.