graphic: 0.618
semantic: 0.476
other: 0.473
device: 0.433
performance: 0.369
debug: 0.191
network: 0.182
permissions: 0.158
boot: 0.115
PID: 0.098
files: 0.068
vnc: 0.042
socket: 0.042
KVM: 0.026

Man page documents qemu -drive if=scsi but it no longer works

The qemu man page section documenting the -drive option contains

           if=interface
               This option defines on which type on interface the drive is
               connected.  Available types are: ide, scsi, sd, mtd, floppy,
               pflash, virtio, none.

but if=scsi no longer works as of version 2.12.0.

If you really have to make backwards incompatible changes, it would be helpful if you could at least document them.

The -drive if=scsi still works on the machines that have a SCSI bus by default. And the change for x86 has been documented in the ChangeLog: https://wiki.qemu.org/ChangeLog/2.12