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(s:format)
This adds `s:format` for creating strings from a template. The
format string can have a mix of several actions, each of which
is preceeded by a %. The formatters are:
Action Usage
------ -----------------------------------
%n Insert a number from the stack.
%c Insert a character from the stack
%s Insert a string from the stack
An example:
#3 #2 #1 '%n+%n=%n s:format