Hi all, I am in the slow process of adding support for Python 3.11 in the bytecode project (https://github.com/MatthieuDartiailh/bytecode). While attempting to update some tests I stumbled upon the need to include CACHE opcode to get things to work. For example, one can use bytecode to manually assemble the bytecode for the function: def f(): return 24 < 42 Under Python 3.10 it would look like: f.__code__= Bytecode( [ Instr("LOAD_CONST", 24), Instr("LOAD_CONST", 42), Instr("COMPARE_OP", Compare.LT), Instr("RETURN_VALUE"), ] ).to_code() Under Python 3.11 I had to go to: f.__code__= Bytecode( [ Instr("RESUME", 0), Instr("LOAD_CONST", 24), Instr("LOAD_CONST", 42), Instr("COMPARE_OP", Compare.LT), Instr("CACHE", 0), Instr("CACHE", 0), Instr("RETURN_VALUE"), ] ).to_code() Reading the doc for the dis module I understand the need for the RESUME instruction. However the documentation is rather vague in regard of CACHE. In particular when using the first version, the code in the function ends up looking like '\x97\x00d\x00d\x01k\x00\x00\x00\x00\x00' even though bytecode generated '\x97\x00d\x00d\x01k\x00S\x00'. One can "see" that the two caches (\x00\x00\x00\x00) have been added automatically but the return disappeared. Is this a bug in 3.11 and if not where can I find more details regarding where one expect CACHE instructions to be present ? Best Matthieu C. Dartiailh PS: I know the mailing list is going to be retired but I did not yet got everything configured for Discourse.