* uniq: Add counting option (WIP!)
Usage:
fetch https://raw.githubusercontent.com/timbray/topfew/master/test/data/access-1k | lines | wrap item | uniq | sort-by count | last 10
* uniq: Add first test
* uniq: Re-enable the non-counting variant.
* uniq: Also handle primitive lines.
* uniq: Update documentation
* uniq: Final comment about error handling. Let's get some feedback
* uniq: Address review comments.
Not happy with the way I create a TypeError. There must be a cleaner
way. Anyway, good for shipping.
* uniq: Use Labeled_error as suggested by jturner in chat.
* uniq: Return error directly.
Co-authored-by: Christoph Siedentop <christoph@siedentop.name>
