message: Consistency derives Copy
  This makes it easier to pass around by value a Consistency rather than
  forcing a clone(). This is fine as the size of a Consistency value is
  a single machine word typically.
diff: @@ -10,7 +10,7 @@ use types::*;
  /// `Consistency` is an enum which represents Cassandra's consistency levels.
  /// To find more details about each consistency level please refer to Cassandra official docs.
  -#[derive(Debug, PartialEq, Clone)]
  +#[derive(Debug, PartialEq, Clone, Copy)]
  pub enum Consistency {
  /// A write must be written to the commit log and memtable on all replica nodes in the cluster
  /// for that partition key. Provides the highest consistency
  