var listID: String

### In ContactsList.swift extension Contact

`// In order for the list to update properly when fetch changes from the cloud, we need to use something other than the contact ID for the list item ID.`
`var listID: String { "\(self.id)\(Self.listIDSeparator)\(self.name)" }`

The problem with this approach is when you start adding more fields to Contact. Your approach doesn't guarantee updates when changes are fetched.

I propose changing to the following:
`var listID: String { "\(self.id)\(Self.listIDSeparator)\(self.userModificationDate)" }`

In my testing, this solves all update issues regardless of adding fields to Contact.

Thoughts?