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As an update, building the chrome devtools with the wasm limit set to 12Mb following that guide worked fantastic. Highly recommend it. (Though there are a few paths that are out of date, I had to consult google's devtools docs.)
The problem is that `PyInit_imp_dummy` takes a spec argument which it ignores. Then the test calls it without a spec.
https://github.com/python/cpython/blob/082d3495d0c820972f09f6109a98ed7eb5a7b79f/Modules/_testmultiphase.c#L897
Minimized trigger:
```
import importlib
import imp
spec = importlib.util.find_spec('_testmultiphase')
imp.load_dynamic("test.imp_dummy", spec.origin)
```
Causes `RuntimeError: null function or function signature mismatch`