getSync on Reference to function

[mifopen]

I'm trying to return a function wrapped into Reference from an isolate and then access some custom-defined field with getSync. But this line of code prevents this

isolated-vm/src/module/reference_handle.cc

Line 455 in 61bc6a8

throw RuntimeTypeError("Reference is not an object");

Is it some strong requirement that is impossible to work around or just something not implemented?
I thought that it's legal if I'm not trying to deref function and just access some field on it.

[laverdet]

Seems like an oversight. We have to be careful in that place to avoid invoking accessor functions which may jump into user code without a timeout.