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How is this any different than a mature tool such as SWIG (https://www.swig.org/)?

I've used SWIG extensively with Python to call C code and import C headers for testing/tooling purposes.

SWIG generates binding code. This is dynamic.

It's the Go equivalent of Python's ctypes, I think?

Had the same association in mind. Interesting that Python had this since more or less forever but Go is only now rediscovering the possibility.