Optimisation

[alexkazik]

• Implements: Using swap deletion to maintain 'packed' array #23, Feature request: Set #26
• Debug uses the debug fmt functions
• Display&Debug no longer require std
• Indexing no longer requires K to be Eq (just PartialEq, as everything else)
• All Iters are now also: DoubleEnded, ExactSize and Fused

Warning this is a breaking change since some of the Iter types change and the iter functions are no longer const (but others are).

Set Iter's uses slightly uncommon name. But the only way to go around it would be to export the set module and not via lib.

If you don't like parts of it, just tell me and I'll remove them.

I've also noticed that some, but not all, similar functions have must_use. And The functions names/types sometimes differ from HashMap.

[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 3min)

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 3min)

[yegor256]

@alexkazik thanks a lot!!

[yegor256]

@rultor release, tag is 0.0.15

[rultor]

@rultor release, tag is 0.0.15

@yegor256 OK, I will release it now. Please check the progress here

[rultor]

@rultor release, tag is 0.0.15

@yegor256 Done! FYI, the full log is here (took me 3min)