got.extend doesn't support "unix:" protocol

[OmgImAlexis]

Describe the bug

• Node.js version: v10.13.0
• OS & version: Unraid 6.8.0-rc0e

Actual behavior

UnhandledPromiseRejectionWarning: UnsupportedProtocolError: Unsupported protocol "unix:"

Expected behavior

UnhandledPromiseRejectionWarning: RequestError: connect ENOENT /var/run/docker.sock

Code to reproduce

Doesn't work:

got.extend({ baseUrl: 'unix:/var/run/docker.sock' }).get('/images/json');

Works:

got('unix:/var/run/docker.sock:/images/json');

Checklist

• I have read the documentation.
• I have tried my code with the latest version of Node.js and Got.

[OmgImAlexis]

I found a work around but this seems wrong to use.

got.extend({socketPath:'/var/run/docker.sock', protocol: 'http:'})('/images/json')