I was wondering if CI would catch that InterpolatedStringNode#parts could be not only:

        kind:
          - StringNode
          - EmbeddedStatementsNode

But also EmbeddedVariableNode (which I figured out by checking prism.c).
But unfortunately the CI does not catch this.
I guess we would need some kind of runtime type checks for this, and steep seems to only do static type checks.

Is there maybe a way to do runtime type checks using Sorbet?
I read https://sorbet.org/docs/runtime quickly but did not find an easy way to enable runtime checks using the .rbi files we have.
Maybe @paracycle or someone else would know better about that?

I added my own runtime checks in nodes initialize constructors, only added by the template if $CHECK_FIELD_KIND is set.