Return an `.all` property with both stdout and stderr intermixed about execa

[sindresorhus]

No, like the above, where result.all is a string.

[sotojuan]

Do you want this in an object? Like:

{
  stdout: "...",
  stderr: "..."
}

Or using another representation?

[sindresorhus]

Note to self: This should be a lot easier now that we use spawn by default. We could just merge the stdout/stderr streams before passing the merged stream into get-stream. This should wait until we're done with all the other work though.

https://www.npmjs.com/package/merge-stream

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