Support JSON.stringify of objects

[yogat3ch]

Hi @jonthegeek!
I was wondering if cookies can support JSON.stringify of objects passed as the cookie_value? This will allow for a simplification of usage where a single app cookie object with a bunch of values can be written/read.

[jonthegeek]

I definitely like the idea, but I don't think I like where you put it. That should be a fairly dumb bridge between the R code and the JS code. I want to make sure we're doing this in a place where we can control the error messaging (and, eventually, logging).

That said, I'd rather have it and then refactor, than not have it at all. Looking at the code, the place I'd put it isn't cleanly available right now; I really need to do some work on this package overall!

Soooo.... ok, I'll go ahead and accept this, but I'm writing an issue or three first to make sure I fix it 🙃

[jonthegeek]

While I'd prefer that this be handled differently (see #78), this is definitely an incremental improvement, and the handling should remain invisible to the user even after I refactor.

Thanks for the idea!