New comment by leahneukirchen on mblaze repository

https://github.com/leahneukirchen/mblaze/issues/171#issuecomment-582847838

Comment:
>       An action may be followed by an "extra" string.  When such a command is
>       entered while running less, the action is performed, and then the extra
>       string is parsed, just as if it were typed in to less.  This feature
>       can be used in certain cases to extend the functionality of a command.
>       For example, see the "{" and ":t" commands in the example below.  The
>       extra string has a special meaning for the "quit" action: when less
>       quits, first character of the extra string is used as its exit status.