records not visible in provider devtools extension

[Alvish0407]

Describe the bug
Dart records are not visible in the provider's DevTools extension.

To Reproduce

1. Create an InheritedProvider containing a record field.
2. Check the field value in DevTools. It will show <unknown error> (I have used a typedef for the record).

Expected behavior
The record value should be visible.

typedef Coordinates = ({double lat, double long});

final Coordinates coordinates;

[Alvish0407]

related to #890