Issue #3411419 by catch, lauriii, larowlan, kevinquillen: Regression from...
Issue #3411419 by catch, lauriii, larowlan, kevinquillen: Regression from #2521800: using machine name element for ListStringItem breaks with existing data
(cherry picked from commit 7ca3f9e2)
$this->assertAllowedValuesInput($input,'The machine-readable name must contain only lowercase letters, numbers, and underscores.','String value with dot is not supported.');