Zero-downtime minor upgrade of tools

[knu]

Suppose you’ve run mise use rust@latest python@3.11, which is quite common. You currently have rust@1.82.0 and python@3.11.10 installed, and you decide to upgrade them to their latest releases. As soon as you start mise upgrade, you find that you can’t run rust or python until the new versions finish installing. Your scheduled background jobs are failing. This occurs because the upgrade process immediately creates installs/rust/1.83.0 and installs/python/3.11.11 before the build stage completes, and mise picks those half-installed or currently empty versions, effectively breaking your environment during the upgrade.

I ended up writing a script like this: https://gist.github.com/knu/86c3d1a2c4cbcf02b1d6306fdffd8ded

Could there be support for this situation on the mise side?