void ICollectionSource <T> .CopyTo(T[] array, int arrayIndex) => ListExt.CopyTo(this, array, arrayIndex);
void ICollection <T> .CopyTo(T[] array, int arrayIndex)
{
ListExt.CopyTo(this, array, arrayIndex);
}
void ICollectionSource <T> .CopyTo(T[] array, int arrayIndex) => ListExt.CopyTo(this, array, arrayIndex);
void ICollection <T> .CopyTo(T[] array, int arrayIndex)
{
ListExt.CopyTo(this, array, arrayIndex);
}