This is a respresentation of Cw4Contract for storage. Don't use it directly, just translate to the Cw4Contract when needed.
Cw4Contract is a wrapper around HumanAddr that provides a lot of helpers for working with cw4 contracts
A group member has a weight associated with them. This may all be equal, or may have meaning in the app that makes use of the group (eg. voting power)
TOTAL_KEY is meant for raw queries
member_key is meant for raw queries for one member, given canonical address