Fix clone with SPECIO_IMPLEMENTATION=PP

[arodland]

Passes dzil test except for precious (because I don't have all of the tools installed).

[autarch]

Hi, thanks for your PR! I'm pretty finicky about my projects (see this blog post for details), so I rarely merge a PR as-is. I can move forward on your PR in one of two ways:

1. I check it out locally, fiddle with it as needed, merge it locally, and simply close this PR. This will preserve at least one commit with your name on it, but the PR will show up as closed in your GitHub stats.
2. If you enable me to push directly to your PR branch (which is the default when you make a PR), I can do my fiddling, then force push to your PR branch and merge the resulting PR. Again, this will preserve at least one commit with your name on it, but you also get credit for the PR merge in your GitHub stats. The only downside is that I will be force pushing directly to your PR branch. Note that this will not work if the PR branch is named master. GitHub doesn't allow me to push to the default branch of your fork.

Please let me know which approach you'd prefer. If I don't hear from you before I get around to working on this PR I'll go with option 1.

Thanks again for your contribution!

[arodland]

2 is fine

[arodland]

Either is fine 🙂

[arodland]

@autarch do you have time for a release?

[autarch]

@autarch do you have time for a release?

Oops, I meant to do this right after I merged this. I just released 0.52.