How to print 2d array

The issue here is that the array is being flattened and a!foreach() sees it as 6 items, vs 3 pairs of 2 items each.  I'm not sure if we can unflatten it directly within a primitive data type.

Are you able to control the array, such as formatting it to key/value pairs? Such as:

a!localVariables(
  local!a: {
    {value: {1,2}},
    {value: {3,4}},
    {value: {6,7}}
  },
  a!forEach(
    items: local!a,
    expression: joinarray(fv!item.value,",")
  )
)

Or, do we know that this data will always be an array of 2-valued nested arrays?  Such as:

a!localVariables(
  local!a: {{1,2},{3,4},{6,7}},
  a!forEach(
    items: 1+enumerate(count(local!a)/2),
    expression: joinarray(
      a!foreach(
        items: {fv!item*2-1,fv!item*2},
        expression: index(local!a,fv!item,null)
      ),
      ","
    )
  )
)

We can nix the nested a!foreach() in the second example above as well:

a!localVariables(
  local!a: {{1,2},{3,4},{6,7}},
  a!forEach(
    items: 1+enumerate(count(local!a)/2),
    expression: joinarray(index(local!a,{fv!item*2-1,fv!item*2},null),",")
  )
)

We can nix the nested a!foreach() in the second example above as well:

a!localVariables(
  local!a: {{1,2},{3,4},{6,7}},
  a!forEach(
    items: 1+enumerate(count(local!a)/2),
    expression: joinarray(index(local!a,{fv!item*2-1,fv!item*2},null),",")
  )
)

Thanks Chirs for enhancing my knowledge.