Don't resolve when invalid

[RStankov]

You are calling execute and double resolving even when document validation has failed.

[leebyron]

Thanks! This integration point was a last minute addition and a rare undertested part of the library. Thank you for catching this, I'll follow up with better tests.

[valentinzberea]

Honest question: is it possible to resolve a promise twice?

The way I understand promises is that once a promise is resolved, any subsequent calls to resolve() won't have any effect.

[leebyron]

They don't have effect, no :)