ExpressionToPythonMapper: use str instead of repr for map_constant

[matthiasdiener]

$ python -c 'import numpy as np; print(np.__version__, repr(np.int32(42)))'  # numpy 2
2.0.0 np.int32(42)

$ python -c 'import numpy as np; print(np.__version__, repr(np.int32(42)))'  # numpy<2
1.26.4 42

😱

This fixes the meshmode test failures seen in e.g. inducer/pyopencl#771

[matthiasdiener]

I wonder if more errors like this are there. I could not find any other test failures at least.

[alexfikl]

FYI, this seems to be the same error as inducer/pymbolic#141. I fixed the test instead of fixing the mapper there, but we should have the same fix in both places!

[inducer]

Thanks! #845 is an alternative, closing here.