What doctrinal value does the Catholic Church place on "Cantate Domino"?

If I understand correctly, Cantate Domino is a papal bull by Pope Eugene IV which is in some way affiliated with the Council of Florence. I have heard it claimed that the writing of Cantate Domino was an instance of *papal infallibility*, but if I understand correctly, there are very few instances in which it is widely agreed that a pope spoke ex cathedra, and Cantate Domino is not one of them. That being said, the Council of Florence is an ecumenical council. My understanding is that some but not all aspects of ecumenical councils are infallible. Was the writing of Cantate Domino an instance of the *infallibility of ecumenical councils*? What is the precise relationship between Cantate Domino and the Council of Florence? If not, is Cantate Domino nevertheless a product of the (infallible) Sacred Magisterium? Or is it merely a product of the (fallible but authoritative) Ordinary Magisterium?