Currently the model looks like this:

leaf split-horizon-group {
when "../bridge-domain";
type uint8

{ range "1..255"; }

description
"Interface's split-horizon group. Interfaces in the same
bridge-domain and split-horizon group can not forward
packets between each other. ";
}

This has a few drawbacks:

• Default is 0, which is undocumented (0 means no shg) - document
• Once anything besides 0 is set, it cannot be un-set - change the type to start from 0. or make it a union with some default "unset" value