Good point. Here's one off the top of my head: a giant map that caches some count by date. You can represent this as a map[time.Time]int (native Go time type),

Good point. Here's one off the top of my head: a giant map that caches some count by date. You can represent this as a map[time.Time]int (native Go time type), a map[string]int (time represented in some string format), or a map[int]int (time represented as an integer like 20190718).