Parsing issue with empty Arrays

Watch this simple example using the binopsy parser vs. the original binary-parser. We expect to end up with the same result, but some data is missing when using binopsy.

const Binopsy = require('binopsy').Parser;
const BinaryParser = require('binary-parser').Parser;

function makeParser(Parser) {
  const inner = Parser.start()
    .string('airportCode', {
      length: 3,
    })
    .uint8('count')
    .array('subs', {
      type: Parser.start()
        .uint8('val'),
      length: 'count',
    });

  const outter = Parser.start()
    .uint8('type')
    .choice('inner', {
      tag: 'type',
      choices: {
        1: inner,
        2: inner,
      },
    });
  return outter;
}

const binopsy = makeParser(Binopsy);
const binaryParser = makeParser(BinaryParser);

const buf = binopsy.serialize({
  type: 1,
  inner: {
    airportCode: 'BER',
    count: 0,
    subs: [],
  },
});
console.log(buf);
console.log(JSON.stringify(binopsy.parse(buf), null, 2));
console.log(JSON.stringify(binaryParser.parse(buf), null, 2));

The output:

<Buffer 01 42 45 52 00>
{
  "type": 1,
  "inner": null
}
{
  "type": 1,
  "inner": {
    "airportCode": "BER",
    "count": 0,
    "subs": []
  }
}

Any ideas on how to fix this?
Thanks anyway for the nice serializing feature!

BR,
Martin

Start by running the JavaScript reproducer in the issue and compare the serialized output and parsed results from binopsy and binary-parser. Trace the array and choice parser entry points involved in parsing a zero-length subs array; done means the parsed result preserves the inner object with airportCode, count, and an empty subs array.