docs: function selectValueType(props, propName, componentName) {
    if (props[propName] == null) {
      return null;
    }
    if (props.multiple) {
      if (!Array.isArray(props[propName])) {
        return new Error(
          ("The `" + propName + "` prop supplied to <select> must be an array if ") +
          ("`multiple` is true.")
        );
      }
    } else {
      if (Array.isArray(props[propName])) {
        return new Error(
          ("The `" + propName + "` prop supplied to <select> must be a scalar ") +
          ("value if `multiple` is false.")
        );
      }
    }
  }