sort_by is broken

[StefanKarpinski]

The mutating versionsort_by! is fine.

[JeffBezanson]

Does this fix it:

diff --git a/j/sort.j b/j/sort.j
index 88502b2..51b1c4d 100644
--- a/j/sort.j
+++ b/j/sort.j
@@ -309,7 +309,7 @@ end
 @in_place_matrix_op sort
 @in_place_matrix_op sort lt::Function
 @in_place_matrix_op sortr
-@in_place_matrix_op sort_by
+@in_place_matrix_op sort_by by::Function

?

[StefanKarpinski]

I dunno. I tried that while we were on the phone and it didn't seem to. Can try again.