docstring bformat(docstring const & fmt, int arg1, int arg2);
docstring bformat(docstring const & fmt, docstring const & arg1, docstring const & arg2, docstring const & arg3);
docstring bformat(docstring const & fmt, docstring const & arg1, docstring const & arg2, docstring const & arg3, docstring const & arg4);
docstring bformat(docstring const & fmt, int arg1, int arg2);
docstring bformat(docstring const & fmt, docstring const & arg1, docstring const & arg2, docstring const & arg3);
docstring bformat(docstring const & fmt, docstring const & arg1, docstring const & arg2, docstring const & arg3, docstring const & arg4);