Support React.memo

[billyjanitsch]

Currently, concordance crashes while trying to encode components wrapped in React.memo. These components are objects rather than functions or classes, which I suspect concordance doesn't know how to handle.

[novemberborn]

Could you share a crash report and reproduction?

I'll definitely want to support this. Perhaps you're willing to try your hand at it? 😉 Hopefully it doesn't require a breaking change in AVA…

[billyjanitsch]

See #17 for a repro and trace. I won't have time to dig into a fix for awhile but I'm happy to try if no one's gotten to it by then. 🙂

[novemberborn]

Thanks @billyjanitsch. Could you have a look at #19 and see if my changes are sensible? For instance the ⍝ character, and how if you apply React.memo() twice to the same component, and then compare <first /> with <second /> they're considered equal?

[novemberborn]

Also this new code does support existing serializations, so while we have to bump the snapshot version in AVA itself we can retain compatibility with v2 so we don't need to ship a new major version of AVA.

[novemberborn]

@billyjanitsch would be great if you could have a look at #19, thanks 😄