DartBot

**Comment by [lrhn](https://github.com/lrhn)** --- That should be doable. For each operand, remember each object it is currently being compared to, and if you see that combination again, return true. It's...

**Comment by [nex3](https://github.com/nex3)** --- I believe YAML's deepEquals operation works like that, but it remembers the order of the objects it's being compared to as well.

**Comment by [kevmoo](https://github.com/kevmoo)** --- Aligning w/ the bits offered from matcher would be nice, too. Fewer implementations FTW

**Comment by [nex3](https://github.com/nex3)** --- Matcher's use case is a little different, because it needs to track a bunch of extra information to provide useful messaging when the equality fails.

**Comment by [munificent](https://github.com/munificent)** --- _Marked this as blocking dart-lang/sdk#7489._

**Comment by [srawlins](https://github.com/srawlins)** --- I think it would be crazy unexpected if on a non-Windows system, args parsed arguments starting with a / as an option. IE: my_dart_script --foo=bar /baz...

**Comment by [munificent](https://github.com/munificent)** --- Yeah, I don't think we should support any of this on non-Windows platforms. Platform.isWindows is probably the right approach, but note that that's a breaking change...

**Comment by [floitschG](https://github.com/floitschG)** --- _Added [Area-Pkg](../labels/Area-Pkg), [Triaged](../labels/Triaged) labels._

**Comment by [sethladd](https://github.com/sethladd)** --- I wonder if the team would be open to a patch for this? --- _Removed [Priority-Unassigned](../labels/Priority-Unassigned) label._ _Added [Priority-Low](../labels/Priority-Low), [Pkg-Args](../labels/Pkg-Args) labels._

**Comment by [srawlins](https://github.com/srawlins)** --- In order to make this a _not_ breaking change, we could derive `allowedHelp` from `allowed` if `allowed` is a Map, but otherwise still accept an `allowed`...