I noticed that the latest time we needed to switch the idf key was when
the environment changed from python 3.10.4 to 3.10.5. I don't know if
this is the only cause of needing to change the key, but it seems to be
a good idea to make the key include it.
I think this is what's going on because when I replaced a virtualenv's
"python" with a dangling symlink (same as would occur when python's
version gets bumped), I got a similar error.
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