Still checking non-dependencies in node_modules

The release notes of 0.57.0 mention this new feature:

> Flow will now only check the files in `node_modules/` which are direct or transitive dependencies of the non-`node_modules` code.

However, even with 0.57.3 (on Windows 7, if that matters), I'm still experiencing the same issue as in these reports:

#5023
https://github.com/dcodeIO/bcrypt.js/issues/66

The `bower.json` file is neither a direct nor a transitive dependency of my non-node_modules code, but it still gets checked, which results in a failure.

If I rename it so it doesn't have a `.json` extension, Flow stops checking it.

I've also noticed from the server output that Flow is monitoring `.css` and `.png` files in node_modules for changes, which seems like unnecessary extra work.

Is this a bug or intentional?