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8d9bb97461
`EACCES` is returned if the file mode bit (i.e., user/group/other rwx bits) disallow access. `EPERM` is returned if something else denies access (immutable bit, SELinux, capabilities, etc). This somewhat subtle no-access distinction is part of POSIX. For now map both to `error.PermissionDenied` to keep the error signature unchanged. See duopoly. This PR is effecitvely an update/simplification of PR #19193. Tested locally with an immutable file. Fixes #22733 and #19162.