Strategy for invalidating the cache when package variables change.

[jimhester]

The global variables lintr looks for variables defined in the current package, however if lintr is run before the function or variable is defined, then it is defined later the cache needs to be invalidated and re-linted so that the new variable is picked up.

Maybe the easiest thing to do is just never cache expressions that produce this specific lint...

[MichaelChirico]

I'm going to close this -- it hasn't gotten any traction and there's no associated reprex. Jim, feel free to re-open if you plan to work on it / can share a reprex. Otherwise we can wait for a user to report the issue.