Ergonomic, hermetic, user-friendly software build system for Python, Go, Java, Kotlin, Protobuf, Scala, Shell. Pants lets you fearlessly scale up your codebase!

Pants

oh man.
Unpicking a project from "eh, it all uses 3.9"
to "the pants-plugins use 3.11, the target runtime uses 3.10, and the 3.11 plugins generate 3.10 code for the target runtime, but anything else can be whatever"
is uh... 'fun'

I _think_ I've sorted it now (but it's a bit of a game of whackamole)
• Set the global `interpreter_constraints` to 3.10
• Created a `pants-plugin` resolve, constrained to 3.11
• Created a `plugin_sources` and `plugin_tests` macro which sets the resolve to `pants-plugins` and Interpreter-constraints to `==3.11.*` 
• created a flake8 resolve, with BOTH interpreter constraints (this is key, otherwise it seems to use the default, then cry when linting pants code)

~but now my pytest plugins aren't being installed >_>~ duh, wasn't telling pants to install them