Implement Eq and Debug traits

[Stupremee]

This pr implements the PartialEq, Eq and the Debug traits.
These additions were requested in #10

[codecov]

Codecov Report

Merging #21 into master will decrease coverage by 1.64%.
The diff coverage is 66.66%.

Impacted Files	Coverage Δ
src/lib.rs	81.59% <66.66%> (-2.35%)	⬇️

[jonhoo]

I think it would be good to call out in the documentation (probably under "Consistency") the fact that checking for map equality might yield weird results if the map is being concurrently modified!

[Stupremee]

Tests are failing because the len check is missing in PartialEq trait

[Stupremee]

I recreated your idea here and it doesn't work.

[Stupremee]

I will just leave it as it is and we can implement it later if possible.
Unless you find a solution

[jonhoo]

Ah, that is too bad. Well, since the current Index impl doesn't work either, I think we should then just remove the impl of Index for the time being :)

[Stupremee]

Okay. I will just add Debug impl too

[jonhoo]

Excellent, thank you!