Fix InterfaceProxy to work with null values.

[s-ludwig]

Previously caused crashes and opCast!bool to return true for null instances.

[wilzbach]

We should probably replace those flaky AppVeyor tests with GitHub actions.

[s-ludwig]

We should probably replace those flaky AppVeyor tests with GitHub actions.

Yeah, would be nice to unify the CI. I haven't looked into GitHub actions so far, though (maybe I should have done that instead of migrating to appveyor.com).

[wilzbach]

We should probably replace those flaky AppVeyor tests with GitHub actions.

Yeah, would be nice to unify the CI. I haven't looked into GitHub actions so far, though (maybe I should have done that instead of migrating to appveyor.com).

If you enable GitHub actions for this repo, I can play with it on #229.

[s-ludwig]

Actions are enabled, could it be that the workflows name "test.yml" requires additional configuration before it gets executed?

[wilzbach]

Hmm, they run here: https://github.com/wilzbach/vibe-core/actions/runs/260953798
I think I need to open the PR from a branch of this repo -> #230