In dsi.sdlist, why is cnt needed?

[dthaler]

The doc has:
"sdlist": {
"cnt": "",
"sd": [ … ]
},

The cnt field seems to be redundant with the number of entries in the "sd" array. None of the other JSON arrays in the spec have a separate cnt field. Can it be removed?

Keeping it causes potential consistency problems where a message is received where cnt != # entries in sd array, and would be better to make the problem go away.