Currently, while there is `:into` option in `for`, there is no way to make 
it into "regular" stream. It would be handy to have a way to either make 
something like:

```
for a <- 1..10, b <- 1..10, into: Stream, do: {a, b}
```

Or have additional option:

```
for a <- 1..10, b <- 1..10, stream: true, do: {a, b}
```

That would make `for` to return stream. This can be handy in cases where 
resulted list would be so huge, that it would start to be problematic for 
VM to catch up.

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