Bug in ESLint checking of .eslintrc files in subdirectories. Run 'node setup.js' then 'eslint lib'

setup.js

var fs = require('fs');

fs.mkdirSync('lib');
fs.mkdirSync('lib/foo');

// turn off camelcase check for .eslintrc
fs.writeFileSync('.eslintrc', '{ "rules": { "camelcase": 0 } }');

// this file should not raise error, not inside of lib/foo/*
fs.writeFileSync('lib/foo.js', 'var not_camelcase = 0;');

// turn on camelcase check in lib/foo/*
fs.writeFileSync('lib/foo/.eslintrc', '{ "rules": { "camelcase": 2 } }'); 

// this file should raise error
fs.writeFileSync('lib/foo/bar.js', 'var not_camelcase = 0;');