> Does this test that partial has been rebound only locally?

That's what it's trying to do, but it's not succeeding :(

The intent is to enforce dynamic-scoping *à la scheme*, like this: https://gist.github.com/xcthulhu/f87fe133f56071b72a45

Which inspires a much simpler test for the correct behavior, which I'll go do now.

Thank you for the review!