getInt method
Retrieve a value from this map
Implementation
int? getInt(String key, [int? defaultValue]) {
  if (!containsKey(key)) {
    return defaultValue;
  }
  dynamic valueDyn = this[key];
  if (valueDyn is int) {
    return valueDyn;
  }
  if (valueDyn is String) {
    return stringToInt(valueDyn, defaultValue);
  }
  return defaultValue;
}