All film cameras were designed to completely rewind the film so you would not accidently think it was a fresh roll of film and shoot it again. We would get people all the time that would not completely rewind the film and then load it back into the camera and shoot it again. The entire roll would be double exposed. The funny part was they would ask us to separate them so they could get all their important photos back.
Not true...
I had a Contax AF RF that allowed the leader to be left on rewind, and the Canon EOS 1 has this option also, along some more EOS Canons.
There may others also from the 1980-90's
And a few compact P/S also had this option.
It was called a CUSTOM FUNCTION on these models.
It seems NONE of the Nikon AF bodies from early on never had this option, even though other brands did offer it in the same era.
BTW, I tear off the leader in an exposed film, so it easy to keep track of exposed and unexposed film. Leader = unexposed, NO Leader = exposed.