While reviewing #4481 this morning, I finally realized what was preventing us from seeing the errors James encountered in #4463.

noStrictGenericChecks: true is one of the tsconfig settings we inherited while trying to mirror our internal tsconfig as closely as possible. If I remove that setting, we see errors very similar to, if not exactly like, what James was seeing. For example:

James has some suggestions on how to fix this, but I'm wondering if we can fix it without needing to e.g. make adapter_ public on foundations...