Jerome Simeon

> I can reproduce, both in the repo mentioned in the original issue and in a brand new create-react-app environment. I have tried with ui-markdown-editor, ui-contract-editor, and ui-concerto, and each...

> One last note before I leave this for the night. I think I see where @dselman was coming from with the differing versions - I read through another older...

A brute-force confirmation that the issue is with the overriding of `instanceof` in the new concerto classes. Those lines in e.g., the model manager: https://github.com/accordproject/concerto/blob/f91da652e15485cd92db8576a4e0e60572a8542e/packages/concerto-core/lib/modelmanager.js#L709 Without those you can properly...

I think this open issue in babel is related: https://github.com/babel/babel/issues/4452

Update: still persists.

> I can reproduce this in the Markdown Editor - so it's nothing to do with the Contract Editor. Original issue was filed pre-slate 0.57 pre-web-components

Wouldn't a testing component be useful? Maybe we don't need this.

> Hello @dselman I would like to work on this feature. Is this still open? Hi @sanketshevkar As far as I can tell this is still open. You can test...

Would this issue overlap with / be partially resolved by https://github.com/accordproject/concerto/pull/160 addressing https://github.com/accordproject/concerto/issues/157 ?

I'm wondering how errors during validation are reported by the Concerto UI. Will it work with the Error logger in Cicero UI?