TypeSetter.forInternal resets last known rune bound on new line

Closes #5

setter.go

@@ -296,6 +296,7 @@ func (setter *TypeSetter) forInternal (iterator RuneIterator, fakeNull bool) {
 			})
 			if !keepGoing { return }
 			index ++
+			lastCharRightBound = fixed.Int26_6(0)
 		}
 	}