cleanupValue = (value, nodeName, width, height) => {
  const match = regEnableBackground.exec(value);

  if (match != null && width === match[1] && height === match[3]) {
    return nodeName === 'svg' ? undefined : 'new';
  }

  return value;
}
@param {string} value Value of an enable-background attribute or style declaration.
@param {string} nodeName Name of the node the value was assigned to.
@param {string} width Width of the node the value was assigned to.
@param {string} height Height of the node the value was assigned to.
@returns {string | undefined} Cleaned up value, or undefined if it's redundant.