I am -1 to this feature because compared with other optimization levels this can have unknown effects on the runtime, especially on dependencies you do not control. dataclasses is an example, but much more exist. To support this feature we would need also another extension for pyc files (like pyo) but (pyo) cannot be used to preserve backwards compatibility. Also, the feature will mainly serve to reduce file size, not much to speed up the runtime as any gain will be constant at definition time. IMHO the maintenance cost is too high for what the value is and it also has some potentially unintended dangerous consequences.