scalaz/scalaz — pull request #157 by S11001001 (2012-09-24 13:53:07+00:00)
Title: Curry xmaps in core, for better inference.

Left iterv alone, as it's for compatibility.

```scala
scala> val greet = mapVLens[String, Int]("greetings")
greet: scalaz.package.@>[Map[String,Int],Option[Int]] = scalaz.LensTFunctions$$anon$5@1a7bfda8

scala> greet.xmapB(_ map (_ toString))(_ map (Integer parseInt))
res5: scalaz.LensT[scalaz.Id.Id,Map[String,Int],Option[java.lang.String]] = scalaz.LensTFunctions$$anon$5@4fb4399c
```