CollectionEnvelope<T>, ListEnvelope<T>, etc. should support the Stream<T> in ctor

[dgroup]

What do you think about adding a separate constructor to CollectionEnvelope<T>, ListEnvelope<T> which allows to pass Stream instead of collection?

It allows to have lazy initialization without scalar+sticky.

[victornoel]

@dgroup could you show an example of what you mean by "It allows to have lazy initialization without scalar+sticky."?

There are two different points we have to clarify:

• since Stream is quite similar to Iterator, maybe it would be best to only add it to IteratorOf and then use IteratorOf passed to other classes
• we won't modify the envelopes for this (because it goes counter to what envelopes are for), but it's not a problem since the same should be achievable by a wrapped class instead, that's why I would like to see an example to be sure I clearly understand the need :)