Fix Python 3.12 python hinting errors on MacOS

[jrmccluskey]

Fixes a bug with load_fast_and_clear that was deleting an index in an array that was later used as intermediate storage instead of setting the value to None in the interim and fixed the list comprehension in the intrinsic operations test that seems to have been accidentally clobbered in an in-between state from an old form and the new one before merging.

Fixes #31047

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[jrmccluskey]

R; @tvalentyn

My M1 mac still doesn't love installing beam on Python 3.12 so I couldn't validate the load_fast_and_clear fix beyond diagnosing it from the tox output you shared, so feel free to port the changes into your environment to double-check

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[tvalentyn]

My M1 mac still doesn't love installing beam on Python 3.12 so I couldn't validate the load_fast_and_clear fix beyond diagnosing it from the tox output you shared, so feel free to port the changes into your environment to double-check

Sure. FWIW you might be able to use docker containers as a workaround.

[tvalentyn]

Thanks a lot, @jrmccluskey !