static inline void set_c_parameters(PyObject *level_or_option, ZSTD_CCtx *cctx) {
    // ...
    if (PyLong_Check(level_or_option)) {
        const long level = PyLong_AsLong(level_or_option);
        if (level == -1 && PyErr_Occurred()) {
            return;
        }
        ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, level);
        return;
    }
    // ...
}