[Feature request] Array variables

[gyreas]

In Make, one can do something like val := ent1 ent2 ent3 ..., which Make will interpret as an array. Can we have something similar to it that'll also be compatible with variadic recipes and functions?

Bonus point for "post setting", eg

var := initial
# yada yada
var += additions

[casey]

I'd like this, but currently just only has string-valued variables, which makes things very simple, since you don't need to know the types of anything, and it's always guaranteed to be a string. We can't use += for arrays, because + is already the concatenation operator. Also, justfiles are order independent, so append can't work like that, since there's no sequential order to what's in a justfile.

I would like to have a general solution to this though. We already have * and + args, which are pretty hacky. One approach would be to make everything a list of strings, ala rc.

[ccxuy]

How about considering add dictionary type variables?
Also, passing parameters to recipes are quite weird right now, I need to use just a=1 c=3 func when I need to skip some parameters as workaround in

a:=0
b:=0
c:=0
func a=a b=b c=c:

[casey]

I opened #2458 to track the possibility of making all values lists of strings.