create_bool_feature_flag
                        Creates an instance of a bool feature flag with
                        the specified bool value.
create_feature_flag     Creates the base of a feature flag.
feature_if              Evaluates the provided expression if the
                        feature flag is enabled.
feature_ifelse          Evaluates one or the other expression based on
                        whether the feature flag is enabled.
is_enabled              Checks if the given feature flag is enabled.
is_enabled.bool_feature_flag
                        Checks if the given bool feature flag is
                        enabled
