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This allows third party modules to subclass Kwant's cdef classes. https://cython.readthedocs.io/en/latest/src/userguide/sharing_declarations.html#search-paths-for-definition-files
e9557cf7
This allows third party modules to subclass Kwant's cdef classes. https://cython.readthedocs.io/en/latest/src/userguide/sharing_declarations.html#search-paths-for-definition-files