code: func JSONEqf(t TestingT, expected string, actual string, msg string, args ...interface{}) bool {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	return JSONEq(t, expected, actual, append([]interface{}{msg}, args...)...)
  }
docs: // JSONEqf asserts that two JSON strings are equivalent.
  //
  //  assert.JSONEqf(t, `{"hello": "world", "foo": "bar"}`, `{"foo": "bar", "hello": "world"}`, "error message %s", "formatted")