Missing expand?

[tesujimath]

I may have overlooked it, but something I might call expand, or non-recursive flatten seems to be missing.

What I'm after is this:

> put [1 2 3 [4 5] [6 7]] | for item (all) { put $item }
▶ 1
▶ 2
▶ 3
▶ [4 5]
▶ [6 7]

which differs from flatten:

> put [1 2 3 [4 5] [6 7]] | b:flatten (one)
▶ 1
▶ 2
▶ 3
▶ 4
▶ 5
▶ 6
▶ 7

Is this of interest to you for this library?

[laodzu]

I think what you are after is "exploding" a list as is done by the builtin $@ reference syntax:

>  var li = [1 2 3 [4 5] [6 7]]
> put $li
▶ [1 2 3 [4 5] [6 7]]
> put $@li
▶ 1
▶ 2
▶ 3
▶ [4 5]
▶ [6 7]
> 

I do not know how to call this on an "immediate list", but if we add a new name, why not use explode to stay in sync with the main elvish code?

https://elv.sh/ref/language.html#variable-use