Implement support for Seq

[langpavel]

How Seq should be displayed?

[Diggsey]

It should display up to the first N values, followed by an ellipsis if the sequence continues.

[langpavel]

Ok, does anybody need this? :-) I'm also afraid of side effects. Can iterating of Seq have udesired side effects?

[Diggsey]

Iterating any of the containers could potentially have side-effects given the ability to define properties in JS. I think in this case it's unlikely given the nature of code using ImmutableJS (namely, very pure, functional code)

[langpavel]

I know, but Seq is generated by function unlike other structures backed by data..