在Dart中，List.from和List.of、Map.from和Map.of之间有什么区别？他们的文件并不完全清楚:
/**
* Creates a [LinkedHashMap] instance that contains all key/value pairs of
* [other].
*
* The keys must all be instances of [K] and the values of [V].
* The [other] map itself can have any type.
*
* A `LinkedHashMap` requires the keys to implement compatible
* `operator==` and `hashCode`, and it allows `null` as a key.
* It iterates in key insertion order.
*/
factory Map.from(Map other) = LinkedHashMap<K, V>.from;
/**
* Creates a [LinkedHashMap] with the same keys and values as [other].
*
* A `LinkedHashMap` requires the keys to implement compatible
* `operator==` and `hashCode`, and it allows `null` as a key.
* It iterates in key insertion order.
*/
factory Map.of(Map<K, V> other) = LinkedHashMap<K, V>.of;
/**
* Creates a list containing all [elements].
*
* The [Iterator] of [elements] provides the order of the elements.
*
* All the [elements] should be instances of [E].
* The `elements` iterable itself may have any element type, so this
* constructor can be used to down-cast a `List`, for example as:
* ```dart
* List<SuperType> superList = ...;
* List<SubType> subList =
* new List<SubType>.from(superList.whereType<SubType>());
* ```
*
* This constructor creates a growable list when [growable] is true;
* otherwise, it returns a fixed-length list.
*/
external factory List.from(Iterable elements, {bool growable: true});
/**
* Creates a list from [elements].
*
* The [Iterator] of [elements] provides the order of the elements.
*
* This constructor creates a growable list when [growable] is true;
* otherwise, it returns a fixed-length list.
*/
factory List.of(Iterable<E> elements, {bool growable: true}) =>
new List<E>.from(elements, growable: growable);
差异与泛型有关吗？也许.from家工厂允许您更改列表的类型，而.of家工厂则不允许？我来自Java背景，它使用类型擦除，也许类型在DART中被具体化，而您不能使用强制转换或原始类型来更改列表/映射类型？