What this proposal appears to be proposing is to permit NON-CONTIGUOUS
netmasks such as:

255.128.127.0

Or, in binary:

1111111111 10000000 01111111 00000000

Thus, the network number would actually consist of all 8 bits of octet
one, the first bit of octet two, the last 7 bits of octet 3 and none of
octed four.

Non-contigious masks were allowed up until the CIDR era...

As an exercise in insanity, when I teach my TCP/IP course, I use the
following example

206.183.244.0 / 255.255.255.170

and ask the students to find the subnet address, first usable node, last
usable node and broadcast address for each subnet. Takes them about three
hours and then they appreciate the recommendation that all subnet bits be
contiguous. What it does do very well is hammer home how these things
actually work in terms of varying the host bits and network bits