Usage of " in the Policy.yaml
The Policy.yaml that comes with TYPO3.FLOW3 has the following example:
# resources: # methods: # TYPO3_FooPackage_PropertySetter: "method(TYPO3\FooPackage\SomeClass->setSomeProperty())"
If you follow that example and wrap the string with the " character, then the following expression will fail:
# resources: # methods: # ResourceName: "method(Package\LoginController\SomeClass->setSomeProperty())"
Because of the " the \L will be removed and the expression will not work as expected. If you replace the " with ' it will work.
The examples in the documentation use all the ' character, so it should be enough to change the Policy.yaml that comes with TYPO3.FLOW3. It seems it is a legal escape character for YAML, but it is a bit confusing.
The stripping happens in the YAML paser and not in FLOW3.