Write typespecs

[deadtrickster]

Maybe play with TypEr?

[yurrriq]

I'm working on this a bit now. There are many typos, e.g. atom should be atom().

[deadtrickster]

So how can you describe present typespecs state after merging your PR?

[yurrriq]

In general, what's there is solid, except for what's mentioned in #12. I'd like to see at least all exported functions covered with type specs.

[deadtrickster]

I commited few specialized types like registry(), collector(), buckets(), looks good to me. Let me know what you think.

[yurrriq]

LGTM. I do like when (see comments) for uniformity, if nothing else.

[deadtrickster]

can you please give an example?

[yurrriq]

This example has other issues, but shows what I mean wrt when.

[deadtrickster]

so looks like this task is finished as well as #12. What you think?

[yurrriq]

LGTM