15.3.16 Smalltalk Format Strings -------------------------------- Smalltalk format strings are described in the GNU Smalltalk documentation, class ‘CharArray’, methods ‘bindWith:’ and ‘bindWithArguments:’. <https://www.gnu.org/software/smalltalk/gst-manual/gst_68.html#SEC238>. In summary, a directive starts with ‘%’ and is followed by ‘%’ or a nonzero digit (‘1’ to ‘9’).