> version is used to track versions of macros, so that generated bytecodes can be correctly cached. It must be an integer. This worries me. If you're debugging

> version is used to track versions of macros, so that generated bytecodes can be correctly cached. It must be an integer. This worries me. If you're debugging a macro, you have to remember to increment the version every time you change it, or your changes mysteriously don't take effect. And you have to make sure your macros are clean and deterministic or you might bake things into the cache that don't belong there. > The syntax tree of Python is available through the ast module. That module can be annoying to work with because it doesn't make stability guarantees. I've even had to deal with code that broke in a maintenance release (3.8.4) because of this change: https://bugs.python.org/issue40870 https://bugs.python.org/issue40870 I can't think of any better alternatives, besides doing nothing. But it looks like it'll be unusually easy to use wrong, not to be used lightly.