length (in seconds) for a break initiated by the command `type-break',
overriding `type-break-good-rest-interval'. This provides querying of
break interruptions when `type-break-good-rest-interval' is nil."
- :type 'integer
+ :type '(choice (const nil) integer)
:group 'type-break)
(defcustom type-break-keystroke-threshold