var unique.uniqueMaps

3 uses

	unique (current package)
		handle.go#L42: 	ma, ok := uniqueMaps.Load(typ)
		handle.go#L101: 	uniqueMaps isync.HashTrieMap[*abi.Type, any] // any is always a *uniqueMap[T].
		handle.go#L127: 	a, loaded := uniqueMaps.LoadOrStore(typ, m)