use node $VERSION remains in effect even after I leave a directory

[DrHyde]

Describe the bug

If I have use node 1.2.3 in a .envrc file, I would expect that to take effect when I enter the directory, but to be undone when I go back to the parent dir. This isn't the case, it is "sticky" and remains in effect.

To Reproduce

Create a directory containing a .envrc file something like this. The precise node version doesn't matter:

export NODE_VERSION_PREFIX=v
export NODE_VERSIONS=~/.nvm/versions/node
use node 16

Before entering that directory nvm use 20 (or some other version, just not the same as in the .envrc), then confirm that node -v and nvm which current show the correct version.

Then enter the directory. direnv should say something like direnv: using node 16, which can be confirmed using node -v and nvm which current again.

Go back to the parent directory using cd -. node -v and nvm which current will still show the version of node from the previous directory's .envrc.

Expected behavior

After cd - I expect the version of node to also be restored.

Environment

• OS: MacOS Sonoma
• Shell: bash
• Direnv version: 2.34.0

Additional context

The stdlib appears to implement use node $VERSION by calling load_prefix to twiddle paths, and not by running nvm use $VERSION so I would expect that the paths would be automatically untwiddled just as happens for any other env vars that are altered in .envrc.