QOL API methods

[cswendrowski]

While we're contributing, we were wondering if you had any interest in any of the following quality of life methods we've added to our wrapper for ClassicLevel:

1. compactFull - Convenience function that discovers the first and last key and calls compactRange
2. size - Convenience function that discovers the first and last key and calls approximateSize
3. has - Definitely a feature that would be better if it existed upstream, but iterates keys until specified key is discovered (if at all)

[juliangruber]

I'm +-0 on the first two, as discovering first and last key is cheap, and it's convenient indeed. However it's also simple and infrequently desired enough that it could live in userland.

-1 to the third method, because it means a full table scan and in many scenarios where you need something like leveldb (have a lot of data) isn't actually what you want to do

[vweevers]

Agree with @juliangruber on the first two.

Not sure I understand the third method. Can you give an example?

[juliangruber]

I imagine it's something like https://github.com/juliangruber/level-exists/blob/master/index.js

[vweevers]

Let's assume that's the case (shouldn't require iteration though). That's covered by Level/community#106 so I'll close this.