Failed to find an implementation of trait serialize::serialize::Decodable for core::cell::Cell<bool>

[mitchmindtree]

I've come across this several times now - Is there any reason Cell doesn't implement Encodable / Decodable? I think it'd be really useful.

[jdm]

Similarly, what about RefCell too?

[mitchmindtree]

@jdm I think I just got Cell working, I'll have a go at RefCell too and do a pr soon if the 'make check' passes