In symfony 4.4.X I noticed multiple existing definitions of the Cache Interfaces. After looking at them they are in the symfony package and also the symfony/contracts package. Same in the newest 5.X release.
I am pretty sure this has some (composer related?) reasons but why is the contracts package even additionally required?

Sorry if it is asked regularly. I did not find an issue or documentation of this. Is there anything we can do to be able to replace the package in symfony?