/*
 * Document-method: to_json
 *
 * call-seq: to_json(encoder=Yajl::Encoder.new)
 *
 * +encoder+ is an existing Yajl::Encoder used to encode JSON
 *
 * Encodes an instance of Fixnum to JSON
 */
static VALUE rb_yajl_json_ext_fixnum_to_json(int argc, VALUE * argv, VALUE self) {