GNU gettext utilities: smalltalk-format
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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’).