diff --git a/go/reg_test/run b/go/reg_test/run
index a8ac7c174..c1c9e0ad7 100755
--- a/go/reg_test/run
+++ b/go/reg_test/run
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # ================================================================
-set -e
+#####set -e
 
 # For building with autoconf:
 # * in-directory build:
@@ -138,7 +138,7 @@ mlr_expect_fail() {
     echo "Exit status was $status; expected 1."
     echo "Exit status was $status; expected 1." >> $outfile
   fi
-  set -e
+  #####set -e
   echo >> $outfile
   test $status -eq 1
   # since set -e
diff --git a/go/src/miller/types/mlrval_functions_base.go b/go/src/miller/types/mlrval_functions_base.go
index 1babe5f8e..dcce6ec72 100644
--- a/go/src/miller/types/mlrval_functions_base.go
+++ b/go/src/miller/types/mlrval_functions_base.go
@@ -142,3 +142,13 @@ func _i0__(ma, mb *Mlrval) Mlrval {
 func _f0__(ma, mb *Mlrval) Mlrval {
 	return MlrvalFromFloat64(0.0)
 }
+
+// Return boolean true (binary)
+func _true(ma, mb *Mlrval) Mlrval {
+	return MlrvalFromBool(true)
+}
+
+// Return boolean false (binary)
+func _fals(ma, mb *Mlrval) Mlrval {
+	return MlrvalFromBool(false)
+}
diff --git a/go/src/miller/types/mlrval_functions_booleans.go b/go/src/miller/types/mlrval_functions_booleans.go
index 5bd9e491d..88b9c7c21 100644
--- a/go/src/miller/types/mlrval_functions_booleans.go
+++ b/go/src/miller/types/mlrval_functions_booleans.go
@@ -145,81 +145,81 @@ func le_b_ff(ma, mb *Mlrval) Mlrval {
 
 //  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 var eq_dispositions = [MT_DIM][MT_DIM]BinaryFunc{
-	//           ERROR  ABSENT VOID   STRING INT    FLOAT  BOOL ARRAY MAP
-	/*ERROR  */ {_erro, _erro, _erro, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ABSENT */ {_erro, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*VOID   */ {_erro, _absn, eq_b_ss, eq_b_ss, eq_b_sx, eq_b_sx, _erro, _absn, _absn},
-	/*STRING */ {_erro, _absn, eq_b_ss, eq_b_ss, eq_b_sx, eq_b_sx, _erro, _absn, _absn},
-	/*INT    */ {_erro, _absn, eq_b_xs, eq_b_xs, eq_b_ii, eq_b_if, _erro, _absn, _absn},
-	/*FLOAT  */ {_erro, _absn, eq_b_xs, eq_b_xs, eq_b_fi, eq_b_ff, _erro, _absn, _absn},
-	/*BOOL   */ {_erro, _erro, _absn, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
+//       .  ERROR   ABSENT VOID     STRING   INT      FLOAT    BOOL   ARRAY  MAP
+/*ERROR  */ {_erro, _erro, _erro,   _erro,   _erro,   _erro,   _erro, _erro, _erro},
+/*ABSENT */ {_erro, _absn, _absn,   _absn,   _absn,   _absn,   _absn, _absn, _absn},
+/*VOID   */ {_erro, _absn, eq_b_ss, eq_b_ss, eq_b_sx, eq_b_sx, _fals, _fals, _fals},
+/*STRING */ {_erro, _absn, eq_b_ss, eq_b_ss, eq_b_sx, eq_b_sx, _fals, _fals, _fals},
+/*INT    */ {_erro, _absn, eq_b_xs, eq_b_xs, eq_b_ii, eq_b_if, _fals, _fals, _fals},
+/*FLOAT  */ {_erro, _absn, eq_b_xs, eq_b_xs, eq_b_fi, eq_b_ff, _fals, _fals, _fals},
+/*BOOL   */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*ARRAY  */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*MAP    */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
 }
 
 var ne_dispositions = [MT_DIM][MT_DIM]BinaryFunc{
-	//           ERROR  ABSENT VOID   STRING INT    FLOAT  BOOL ARRAY MAP
-	/*ERROR  */ {_erro, _erro, _erro, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ABSENT */ {_erro, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*VOID   */ {_erro, _absn, ne_b_ss, ne_b_ss, ne_b_sx, ne_b_sx, _erro, _absn, _absn},
-	/*STRING */ {_erro, _absn, ne_b_ss, ne_b_ss, ne_b_sx, ne_b_sx, _erro, _absn, _absn},
-	/*INT    */ {_erro, _absn, ne_b_xs, ne_b_xs, ne_b_ii, ne_b_if, _erro, _absn, _absn},
-	/*FLOAT  */ {_erro, _absn, ne_b_xs, ne_b_xs, ne_b_fi, ne_b_ff, _erro, _absn, _absn},
-	/*BOOL   */ {_erro, _erro, _absn, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
+//       .  ERROR   ABSENT VOID     STRING   INT      FLOAT    BOOL   ARRAY  MAP
+/*ERROR  */ {_erro, _erro, _erro,   _erro,   _erro,   _erro,   _erro, _erro, _erro},
+/*ABSENT */ {_erro, _absn, _absn,   _absn,   _absn,   _absn,   _absn, _absn, _absn},
+/*VOID   */ {_erro, _absn, ne_b_ss, ne_b_ss, ne_b_sx, ne_b_sx, _true, _true, _true},
+/*STRING */ {_erro, _absn, ne_b_ss, ne_b_ss, ne_b_sx, ne_b_sx, _true, _true, _true},
+/*INT    */ {_erro, _absn, ne_b_xs, ne_b_xs, ne_b_ii, ne_b_if, _true, _true, _true},
+/*FLOAT  */ {_erro, _absn, ne_b_xs, ne_b_xs, ne_b_fi, ne_b_ff, _true, _true, _true},
+/*BOOL   */ {_erro, _absn, _true,   _true,   _true,   _true,   _true, _true, _true},
+/*ARRAY  */ {_erro, _absn, _true,   _true,   _true,   _true,   _true, _true, _true},
+/*MAP    */ {_erro, _absn, _true,   _true,   _true,   _true,   _true, _true, _true},
 }
 
 var gt_dispositions = [MT_DIM][MT_DIM]BinaryFunc{
-	//           ERROR  ABSENT VOID   STRING INT    FLOAT  BOOL ARRAY MAP
-	/*ERROR  */ {_erro, _erro, _erro, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ABSENT */ {_erro, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*VOID   */ {_erro, _absn, gt_b_ss, gt_b_ss, gt_b_sx, gt_b_sx, _erro, _absn, _absn},
-	/*STRING */ {_erro, _absn, gt_b_ss, gt_b_ss, gt_b_sx, gt_b_sx, _erro, _absn, _absn},
-	/*INT    */ {_erro, _absn, gt_b_xs, gt_b_xs, gt_b_ii, gt_b_if, _erro, _absn, _absn},
-	/*FLOAT  */ {_erro, _absn, gt_b_xs, gt_b_xs, gt_b_fi, gt_b_ff, _erro, _absn, _absn},
-	/*BOOL   */ {_erro, _erro, _absn, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
+//       .  ERROR   ABSENT VOID     STRING   INT      FLOAT    BOOL   ARRAY  MAP
+/*ERROR  */ {_erro, _erro, _erro,   _erro,   _erro,   _erro,   _erro, _erro, _erro},
+/*ABSENT */ {_erro, _absn, _absn,   _absn,   _absn,   _absn,   _absn, _absn, _absn},
+/*VOID   */ {_erro, _absn, gt_b_ss, gt_b_ss, gt_b_sx, gt_b_sx, _fals, _fals, _fals},
+/*STRING */ {_erro, _absn, gt_b_ss, gt_b_ss, gt_b_sx, gt_b_sx, _fals, _fals, _fals},
+/*INT    */ {_erro, _absn, gt_b_xs, gt_b_xs, gt_b_ii, gt_b_if, _fals, _fals, _fals},
+/*FLOAT  */ {_erro, _absn, gt_b_xs, gt_b_xs, gt_b_fi, gt_b_ff, _fals, _fals, _fals},
+/*BOOL   */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*ARRAY  */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*MAP    */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
 }
 
 var ge_dispositions = [MT_DIM][MT_DIM]BinaryFunc{
-	//          ERROR   ABSENT VOID   STRING INT    FLOAT  BOOL ARRAY MAP
-	/*ERROR  */ {_erro, _erro, _erro, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ABSENT */ {_erro, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*VOID   */ {_erro, _absn, ge_b_ss, ge_b_ss, ge_b_sx, ge_b_sx, _erro, _absn, _absn},
-	/*STRING */ {_erro, _absn, ge_b_ss, ge_b_ss, ge_b_sx, ge_b_sx, _erro, _absn, _absn},
-	/*INT    */ {_erro, _absn, ge_b_xs, ge_b_xs, ge_b_ii, ge_b_if, _erro, _absn, _absn},
-	/*FLOAT  */ {_erro, _absn, ge_b_xs, ge_b_xs, ge_b_fi, ge_b_ff, _erro, _absn, _absn},
-	/*BOOL   */ {_erro, _erro, _absn, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
+//       .  ERROR   ABSENT VOID     STRING   INT      FLOAT    BOOL   ARRAY  MAP
+/*ERROR  */ {_erro, _erro, _erro,   _erro,   _erro,   _erro,   _erro, _erro, _erro},
+/*ABSENT */ {_erro, _absn, _absn,   _absn,   _absn,   _absn,   _absn, _absn, _absn},
+/*VOID   */ {_erro, _absn, ge_b_ss, ge_b_ss, ge_b_sx, ge_b_sx, _fals, _fals, _fals},
+/*STRING */ {_erro, _absn, ge_b_ss, ge_b_ss, ge_b_sx, ge_b_sx, _fals, _fals, _fals},
+/*INT    */ {_erro, _absn, ge_b_xs, ge_b_xs, ge_b_ii, ge_b_if, _fals, _fals, _fals},
+/*FLOAT  */ {_erro, _absn, ge_b_xs, ge_b_xs, ge_b_fi, ge_b_ff, _fals, _fals, _fals},
+/*BOOL   */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*ARRAY  */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*MAP    */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
 }
 
 var lt_dispositions = [MT_DIM][MT_DIM]BinaryFunc{
-	//          ERROR   ABSENT VOID   STRING INT    FLOAT  BOOL ARRAY MAP
-	/*ERROR  */ {_erro, _erro, _erro, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ABSENT */ {_erro, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*VOID   */ {_erro, _absn, lt_b_ss, lt_b_ss, lt_b_sx, lt_b_sx, _erro, _absn, _absn},
-	/*STRING */ {_erro, _absn, lt_b_ss, lt_b_ss, lt_b_sx, lt_b_sx, _erro, _absn, _absn},
-	/*INT    */ {_erro, _absn, lt_b_xs, lt_b_xs, lt_b_ii, lt_b_if, _erro, _absn, _absn},
-	/*FLOAT  */ {_erro, _absn, lt_b_xs, lt_b_xs, lt_b_fi, lt_b_ff, _erro, _absn, _absn},
-	/*BOOL   */ {_erro, _erro, _absn, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
+//       .  ERROR   ABSENT VOID     STRING   INT      FLOAT    BOOL   ARRAY  MAP
+/*ERROR  */ {_erro, _erro, _erro,   _erro,   _erro,   _erro,   _erro, _erro, _erro},
+/*ABSENT */ {_erro, _absn, _absn,   _absn,   _absn,   _absn,   _absn, _absn, _absn},
+/*VOID   */ {_erro, _absn, lt_b_ss, lt_b_ss, lt_b_sx, lt_b_sx, _fals, _fals, _fals},
+/*STRING */ {_erro, _absn, lt_b_ss, lt_b_ss, lt_b_sx, lt_b_sx, _fals, _fals, _fals},
+/*INT    */ {_erro, _absn, lt_b_xs, lt_b_xs, lt_b_ii, lt_b_if, _fals, _fals, _fals},
+/*FLOAT  */ {_erro, _absn, lt_b_xs, lt_b_xs, lt_b_fi, lt_b_ff, _fals, _fals, _fals},
+/*BOOL   */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*ARRAY  */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*MAP    */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
 }
 
 var le_dispositions = [MT_DIM][MT_DIM]BinaryFunc{
-	//          ERROR   ABSENT VOID   STRING INT    FLOAT  BOOL ARRAY MAP
-	/*ERROR  */ {_erro, _erro, _erro, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ABSENT */ {_erro, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*VOID   */ {_erro, _absn, le_b_ss, le_b_ss, le_b_sx, le_b_sx, _erro, _absn, _absn},
-	/*STRING */ {_erro, _absn, le_b_ss, le_b_ss, le_b_sx, le_b_sx, _erro, _absn, _absn},
-	/*INT    */ {_erro, _absn, le_b_xs, le_b_xs, le_b_ii, le_b_if, _erro, _absn, _absn},
-	/*FLOAT  */ {_erro, _absn, le_b_xs, le_b_xs, le_b_fi, le_b_ff, _erro, _absn, _absn},
-	/*BOOL   */ {_erro, _erro, _absn, _erro, _erro, _erro, _erro, _absn, _absn},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn, _absn},
+//       .  ERROR   ABSENT VOID     STRING   INT      FLOAT    BOOL   ARRAY  MAP
+/*ERROR  */ {_erro, _erro, _erro,   _erro,   _erro,   _erro,   _erro, _erro, _erro},
+/*ABSENT */ {_erro, _absn, _absn,   _absn,   _absn,   _absn,   _absn, _absn, _absn},
+/*VOID   */ {_erro, _absn, le_b_ss, le_b_ss, le_b_sx, le_b_sx, _fals, _fals, _fals},
+/*STRING */ {_erro, _absn, le_b_ss, le_b_ss, le_b_sx, le_b_sx, _fals, _fals, _fals},
+/*INT    */ {_erro, _absn, le_b_xs, le_b_xs, le_b_ii, le_b_if, _fals, _fals, _fals},
+/*FLOAT  */ {_erro, _absn, le_b_xs, le_b_xs, le_b_fi, le_b_ff, _fals, _fals, _fals},
+/*BOOL   */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*ARRAY  */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
+/*MAP    */ {_erro, _absn, _fals,   _fals,   _fals,   _fals,   _fals, _fals, _fals},
 }
 
 func MlrvalEquals(ma, mb *Mlrval) Mlrval {
diff --git a/go/todo.txt b/go/todo.txt
index 24499c96d..6b4a1ffc6 100644
--- a/go/todo.txt
+++ b/go/todo.txt
@@ -9,9 +9,12 @@ TOP OF LIST:
 ! come up with some kind of blank-line trigger for miller and a condition for it .....
   o i want this pattern over and over
 
+! csvlite
+
 * UDF nexts:
   ! check for multiple put -f; any/multiple put -e
     > non-flag copy from sort
+  * filter -x
   ! more functions
   ! function metadata, w/ sort-by, for online help
   ! double-check $-anything in begin/end
@@ -41,6 +44,7 @@ TOP OF LIST:
 
 * some more verbs
   o easies first
+  o having-fields -x feature ... or something
   o join, stats1, stats2
 
 * double-check rand-seeding
diff --git a/go/u/try-cst b/go/u/try-cst
index fef672cf2..562b39ebf 100755
--- a/go/u/try-cst
+++ b/go/u/try-cst
@@ -261,10 +261,10 @@ echo; run_mlr --from u/s.dkvp put -q '@sum += $x; @count += 1; print'
 echo; run_mlr --from u/s.dkvp put -q '@sum += $x; @count += 1; print @sum'
 echo; run_mlr --from u/s.dkvp put -q '@sum += $x; @count += 1; print @sum, @count'
 
-echo; run_mlr --from s put -q 'print'
-echo; run_mlr --from s put -q 'print $x'
-echo; run_mlr --from s put -q 'print $x,$y'
-echo; run_mlr --from s put -q 'print $x,$y,$i'
+echo; run_mlr --from u/s.dkvp put -q 'print'
+echo; run_mlr --from u/s.dkvp put -q 'print $x'
+echo; run_mlr --from u/s.dkvp put -q 'print $x,$y'
+echo; run_mlr --from u/s.dkvp put -q 'print $x,$y,$i'
 
 # ----------------------------------------------------------------
 echo; run_mlr --from u/s.dkvp put -q '@sum += $x; dump'
diff --git a/go/u/try-cst.out b/go/u/try-cst.out
index ad46175d9..8bc9e1100 100644
--- a/go/u/try-cst.out
+++ b/go/u/try-cst.out
@@ -2503,13 +2503,7 @@ mlr --from u/s.dkvp put -q @sum += $x; @count += 1; print @sum, @count
 
 
 ----------------------------------------------------------------
-mlr --from s put -q print
-
-
-
-
-
-
+mlr --from u/s.dkvp put -q print
 
 
 
@@ -2517,45 +2511,27 @@ mlr --from s put -q print
 
 
 ----------------------------------------------------------------
-mlr --from s put -q print $x
+mlr --from u/s.dkvp put -q print $x
 0.3467901443380824
--0.7586799647899636
+0.7586799647899636
 0.20460330576630303
--0.38139939387114097
-0.5732889198020006
-0.5271261600918548
-0.6117840605678454
--0.5985540091064224
-0.03144187646093577
-0.5026260055412137
+0.38139939387114097
 
 
 ----------------------------------------------------------------
-mlr --from s put -q print $x,$y
+mlr --from u/s.dkvp put -q print $x,$y
 0.3467901443380824 0.7268028627434533
--0.7586799647899636 0.5221511083334797
+0.7586799647899636 0.5221511083334797
 0.20460330576630303 0.33831852551664776
--0.38139939387114097 0.13418874328430463
-0.5732889198020006 0.8636244699032729
-0.5271261600918548 0.49322128674835697
-0.6117840605678454 0.1878849191181694
--0.5985540091064224 0.976181385699006
-0.03144187646093577 0.7495507603507059
-0.5026260055412137 0.9526183602969864
+0.38139939387114097 0.13418874328430463
 
 
 ----------------------------------------------------------------
-mlr --from s put -q print $x,$y,$i
+mlr --from u/s.dkvp put -q print $x,$y,$i
 0.3467901443380824 0.7268028627434533 1
--0.7586799647899636 0.5221511083334797 2
+0.7586799647899636 0.5221511083334797 2
 0.20460330576630303 0.33831852551664776 3
--0.38139939387114097 0.13418874328430463 4
-0.5732889198020006 0.8636244699032729 5
-0.5271261600918548 0.49322128674835697 6
-0.6117840605678454 0.1878849191181694 7
--0.5985540091064224 0.976181385699006 8
-0.03144187646093577 0.7495507603507059 9
-0.5026260055412137 0.9526183602969864 10
+0.38139939387114097 0.13418874328430463 4
 
 
 ----------------------------------------------------------------