New creates a new concurrent map.

ShardCount is the number of shards used by the map.

ShardCount32 is the number of shards used by the map pre-casted to uint32 to performace issues.

ConcurrentMap is a "thread" safe map of type string:*types.Item.

ConcurrentMapShard is a "thread" safe string to `*types.Item`.

Tuple is used by the IterBuffered functions to wrap two variables together over a channel,.