id,summary,reporter,owner,description,type,status,priority,milestone,version,resolution,keywords,cc
80,Improve Data instance,rl,,"The current Data instance for vectors doesn't define toConstr and gunfold. This breaks some libraries, most notable uniplate. We should define the Data instance like this:

{{{
instance ... => Data (Vector a) where
  gunfold k z c
    | constrIndex c == 1 = k (z fromList)
    | otherwise = error ...

  toConstr v = v `seq` vConstr

  dataTypeOf _ = vType

vConstr = mkConstr vType ""fromList"" [] Prefix
vType = mkDataType ""Vector"" [vConstr]
}}}
",defect,new,major,,,,,