Kevin, no, this patch did not get in, and it also violates RFC.
The index of the IP interface where packets of this Flow are being
received. The value matches the value of managed object 'ifIndex'
as defined in RFC 2863. Note that ifIndex values are not assigned
statically to an interface and that the interfaces may be
renumbered every time the device's management system is
re-initialized, as specified in RFC 2863.