Function get_and_replace

extern/pybind/setup.py:87–94

(
    filename: Path, binary: bool = False, **opts: str
)

# TODO: use literals & overload (typing extensions or Python 3.8)
def get_and_replace(
    filename: Path, binary: bool = False, **opts: str
) -> Union[bytes, str]:
    if binary:
        contents = filename.read_bytes()
        return string.Template(contents.decode()).substitute(opts).encode()

    return string.Template(filename.read_text()).substitute(opts)


# Use our input files instead when making the SDist (and anything that depends