Listing with computed index has wrong length

[translatenix]

The following program prints length = 2:

local l1 = new Listing {
  "foo"
}

local l2 = (l1) {
  [0 + 0] = "bar"
}

length = l2.length

If [0 + 0] is replaced with [0], the program prints the expected length = 1.

[bioball]

Good catch!