archive converts duration in stages

[caalle]

When running k6 archive script.js it converts duration in stages to ms(?) instead of keeping original value. If duration is set in options or from the CLI it keeps the given value, eg 20s.

Example script:

export let options = {
  vus: 15,
  duration: '20s',
  stages: [{
    duration: '15s',
    target: 10
  }]
};

export default function() {};

Produce:

{
  "type": "js",
  "options": {
    "paused": null,
    "vus": 15,
    "vusMax": null,
    "duration": "20s",
    "iterations": null,
    "stages": [
      {
        "duration": 15000000000,
        "target": 10
      }
    ],
    "linger": null,
    "noUsageReport": null,
    "maxRedirects": null,
    "insecureSkipTLSVerify": null,
    "noConnectionReuse": null,
    "userAgent": null,
    "throw": null,
    "thresholds": null,
    }
  },
  "filename": "script.js",
  "pwd": "."
}