The returned object below has duplicate 'RegEx' properties:

    function GenFlatObjectAllTypesHardCoded() {
        return {
...
            "RegEx" : RegExp("a"),
            "RegEx" : /a/,
        }
    }

Only the second 'RegEx' property persists, so we should remove the first line to avoid problems with ES5 strict mode and to prevent confusion when reading the code.