map() doesnt map

[claudemartin]

There's this line:
311: newSet._add(key, data);

But it doesn't use the variable "ret". And it's not clear what happens when I return an array or another set of values. Will it add them all, or will it result in a set of arrays/sets?

[claudemartin]

I changed it to this:
newSet.add(ret)

But only because I really need a "flatMap()" function. With this I can't map to Set-values.

[jfriend00]

I agree that line 311 isn't correct as it was. Let me look into it to see if I should go with your suggestion.