Exact decimal parallel output

import aner.parallel

fn copy_and_add(parameters: List, iteration: Int64, seed: Int64,
                output: OutputRegion<Decimal>) -> Unit {
    let input = cast<FrozenArray<Decimal>>(parameters.get(0))
    let step = cast<Decimal>(parameters.get(1))
    let terms = DynamicArray<Decimal>(capacity: 2)
    terms.append(step)
    terms.append(D(0.2))
    output[0] = input.get(iteration)
    output[1] = terms.sum()
}

let values = Array<Decimal>(size: 3, fill: D(0))
values[0] = D("1234567890123456789012345678901234")
values[1] = D("0.1000")
values[2] = D("-0.00")
let input = values.snapshot()
let serial = parallel.repeat(3, copy_and_add, List(input, D("0.1000")),
    output_shape: List(2), execution: parallel.local(1), seed: 42)
let concurrent = parallel.repeat(3, copy_and_add, List(input, D("0.1000")),
    output_shape: List(2), execution: parallel.local(), seed: 42)
var equivalent = true
for iteration in Range(3) {
    if String(serial[iteration, 0]) != String(concurrent[iteration, 0]) { equivalent = false }
    if concurrent[iteration, 1] != D(0.3) { equivalent = false }
    if serial.seed(iteration) != concurrent.seed(iteration) { equivalent = false }
}
print(equivalent)
print(String(concurrent[0, 0]))
print(String(concurrent[1, 0]))
print(String(concurrent[2, 0]))
print(dtype(concurrent))
print(concurrent.bytes())