Currently, hot reloading is broken when running dev mode in systems
like Bazel, where the source files are marked as read-only. The goal of
the check is merely to see if a file exists, so checking for read
permissions should be sufficient.
Let me know if any additional information is needed. I didn't see any
good spots to add tests, but I'm willing to add them with some
guidance.
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
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