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os_file_is_readonly() in its current form is equivalent to !os_file_is_writable(). This does not appear to be a bug, because Vim's use of check_file_readonly() (which we changed to os_file_is_readonly()) is equivalent to !os_file_is_writable() in every case. os_file_is_readonly() also fails this test: returns false if the file is non-read, non-write A more useful form would define behavior under these cases: - path is executable (but not writable) - path is non-existent - path is directory But there is no reason for os_file_is_readonly() to exist, so remove it.