An issue that somebody found:

       $rootNode
            ->children()
                ->booleanNode('use_mock')
                    ->isRequired()
                    ->cannotBeEmpty()
                ->end()

when using: use_mock: false in the config, it will throw a InvalidConfigurationException: The path "config.use_mock" cannot contain an empty value, but got false.

This will be thrown at line:

Is this a bug, or are there other ways to deal with booleanNodes in this situation?

Gist: https://gist.github.com/jaytaph/08906a3f38ca9f0867f8

(Same issue occurs when using a scalarNode() and using "0" as the config value)