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Glenn Morris authored
* lisp/files.el (make-backup-file-name-function) (make-backup-file-name, make-backup-file-name--default-function) (make-backup-file-name-1, find-backup-file-name) (revert-buffer-function, revert-buffer-insert-file-contents-function) (buffer-stale--default-function, buffer-stale-function) (before-revert-hook, after-revert-hook, revert-buffer-in-progress-p) (revert-buffer, revert-buffer--default) (revert-buffer-insert-file-contents--default-function): Doc fixes related to defaults no longer being nil. (make-backup-file-name-function): Bump :version. Restore nil as a valid but deprecated custom type. * etc/NEWS: Related edit.
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