Generated freezed classes expand == operator parameter to be nullable (dynamic)

[srawlins]

Generated freezed classes declare an operator == override which expands the parameter type (from Object, on Object.==) to a nullable type (dynamic). For example:

  @override
  bool operator ==(dynamic other) {
    return identical(this, other) ||
        (other.runtimeType == runtimeType &&
            other is ListIndexPath &&
            const DeepCollectionEquality().equals(other.index, index));
  }

No Dart runtime passes a null value to an == implementation. Explicitly expanding the parameter type does not seem to serve a purpose, and can lead to confusion that the function will ever see a null argument value. These implementation should not have an expanded parameter type of dynamic.

To Reproduce

Generate a freezed class.

Expected behavior

The class should not expand operator =='s parameter type from Object.

[rrousselGit]

What's the downside to this exactly?