Poke provides a built-in function format that can be used in
order to format, or build, a string value that is derived from a set
of zero or more Poke values:
format (fmt[, value...])
Where fmt is a format string that interpreted verbatim but for
predefined format tags which start with %. These format
tags are interpreted especially. See printf.
Example:
var s = format ("Age is %i32d.", 66);
The value of the variable s is "Age is 66.".