We have a clearLocalData, and a clearProjectData. However I could not help but notice there is no clearGlobalData.
Can we use clearProjectData to clearGlobalData or must we delete an entire project to do so?

This previous discussion may help you.

If you know what keys are already in Global storage, I believe you can clear them by setting their value to nil.

In versions after 1.4.1, you’ll be able to listGlobalData() as a first step to clearing keys by setting their values to nil.

Thanks @mpilgrem, that is correct. Version 1.4.2 and later will allow you to list the keys in global data and nil them out. It’s just taking a long time for version 1.4.1 to be approved, so we haven’t been able to submit 1.4.2 (or whatever it ends up being called when 1.4.1 is approved).