I don't think that it's possible nor worth it to wrap all fcntl() and all
ioctl() calls. I see these functions as very low-level APIs and so I
consider that the caller is responsible of what he/she does.

If you want to change something, explian in fcntl module doc that the PEP
466 is not implemented in this module znd it's a deliberate choice.

I agree with Martin, it's the responsability of the dev to use the right
command depending on the use case.