Under the hood
Useful1 Signal0
Reading a directory as a file is now recognised as a filesystem error.
What's wrong with this entry?
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What
The error classification list in the fetch-and-file area now includes EISDIR, alongside ENOTDIR and EMFILE, so attempts to read a directory as a file are recognised as filesystem errors.
Evidence
"EISDIR"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.