Response always undefined in .calls?

[th3fallen]

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• Configuration
• API
• Troubleshooting

Be clear and precise about what the issue is. Take the time to include details of
what's wrong, including the version of fetch-mock you're using and which environment
it's running in.

• Bad: 'It doesn't work', 'It conflicts with x', 'I get an error'
• Good: 'When using webpack 4 and babel 7 I get an Error: undefined array at line 191
  during compilation'
  When using webpack 5 and babel 7 I am unable to get the responses back from any net

Given:
fetchMock.postOnce('path:/2/account/check/subdomain', { query: 'foo', available: false });
and doing
console.log(fetchMock.calls());
I get...

      [
        'https://api.whenidev.net/2/account/check/subdomain?q=foo',
        { query: [Object], method: 'GET', headers: [Object] },
        request: undefined,
        identifier: 'path:/2/account/check/subdomain',
        isUnmatched: undefined,
        response: undefined
      ]
    ]

I've also attempted mocking it like so...

fetchMock.postOnce('path:/2/account/check/subdomain', { body: { query: 'foo', available: false } });
and same result, it's always undefined.