custodian
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Create py.typed
As recommended in pep 0561, a blank py.typed marker should be included when type hints are used so downstream codes can type check with mypy and similar tools. There aren't many type hints in this code, but there are some.
I also removed the reliance on numpy==1.26.4 in the test suite since this caused other issues due to https://github.com/materialsproject/pymatgen/issues/3990.
@shyuep: Any idea why a Mac build would fail but Ubuntu would pass? The error seems unrelated to this PR by the way --- but I'm stumped.
Edit: Passes now.