Catching incompatible classes before Dart does

[cgrand]

See #177 or https://clojurians.slack.com/archives/C03A6GE8D32/p1676766935857169

Even if deferecord was involved in both cases it can happen with any incompatible classes combination.

If we could catch it at the ClojureDart level rather than waiting for the Dart compiler to complain it would be a usability gain.