The only outstanding backport for new N-APIs is nodejs/node#31384 which brings napi_get_all_property_names to v10.x. Shall we wait until it lands to make off N-API 6 as including napi_get_all_property_names, or shall we leave napi_get_all_property_names experimental and roll N-API 6 without it?

Once we have arrived at a decision, we need to file a PR in core that bumps the NAPI_VERSION and updates the preprocessor if-block into which the N-API declarations are placed.