Value.add Has Unexpected Behavior When Subtracting

[logicalmechanism]

The value.add function during subtraction returns incorrect results as shown in the example below.

Ubuntu 22.04.2 LTS
aiken v1.0.10-alpha 85d82e5
stdlib 1.2

test adding_values_together() {
  let v =
    value.from_lovelace(123)
      |> value.add(#"acab", #"beef", 321)
      |> value.add(#"acab", #"beef", -1 * 321)
  v == value.from_lovelace(123)
}

This test fails when it should pass. The functionality should mirror the value.merge function, removing assets from a value when they are zero. As of right now, it returns a value with just the policy id and an empty dictionary.

  × adding_values_together failed
  help: ┍━ left ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┑
        │ (con string "{_ h\'\': {_ h\'\': 123 }, h\'ACAB\': {} }") │
        ┕━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┙
        
        should be equal to
        
        ┍━ right ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┑
        │ (con string "{_ h\'\': {_ h\'\': 123 } }") │
        ┕━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┙