We've gotten most of the cases, but it'd be good to guard against this explicitly in the codebase.

There are a few times where there were things like the following, which aren't strictly false at runtime, but we prefer to use the enums in the codebase.

if (node.type === 'Identifier') {}

An internal lint rule would mean we can add a fixer, and would save us ever having to mention this in code reviews.