Consider making downloaded files read only.

[back2dos]

This could be annoying as hell though. Perhaps should be an opt-in or something.

[PXshadow]

@back2dos The lix extension warns you when you attempt to edit files in the lix cache, I think that's a pretty good middle ground.

[back2dos]

Yeah, that's a pretty good start, but:

1. not everyone uses VSCode
2. assuming the compiler server could skip checking readonly files for modifications (it doesn't, but it would seem like a sensible strategy), it would reduce the footprint of libraries in incremental builds

The latter was my primary motivation.