Re: Re: Shouldn't collection zip functions return streams?

> Programmers need to know when an operation is strict or not. It will help 
> if the collection libraries have some simple way to know, and not just 
> decided differently for each operation on a case by case basis.
>

Exactly! This is one of the main benefits behind composing computations: 
Nothing gets executed until it is explicitly requested.
This also solves the current issue with "we have this huge collection API 
that creates new values vs. these dozen important mutable operations which 
change the data structure itself – and no good way to discover the 
difference" Haoyi mentioned.

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