diff --git a/pkg/eval/vals/concat_test.go b/pkg/eval/vals/concat_test.go
index cf10c889..aad92d4c 100644
--- a/pkg/eval/vals/concat_test.go
+++ b/pkg/eval/vals/concat_test.go
@@ -51,7 +51,7 @@ func TestConcat(t *testing.T) {
 		Args(concatter{}, "bar").Rets("concatter bar", nil),
 		// LHS implements Concatter but returns ErrConcatNotImplemented; RHS
 		// does not implement RConcatter
-		Args(concatter{}, 12).Rets(nil, cannotConcat{"!!vals.concatter", "!!int"}),
+		Args(concatter{}, 12).Rets(nil, cannotConcat{"!!vals.concatter", "number"}),
 		// LHS implements Concatter but returns another error
 		Args(concatter{}, 12.0).Rets(nil, errBadFloat64),
 
diff --git a/pkg/eval/vals/kind.go b/pkg/eval/vals/kind.go
index 882bb3ff..d19caf61 100644
--- a/pkg/eval/vals/kind.go
+++ b/pkg/eval/vals/kind.go
@@ -2,6 +2,7 @@ package vals
 
 import (
 	"fmt"
+	"math/big"
 )
 
 // Kinder wraps the Kind method.
@@ -27,7 +28,7 @@ func Kind(v interface{}) string {
 		return "bool"
 	case string:
 		return "string"
-	case float64:
+	case int, *big.Int, *big.Rat, float64:
 		return "number"
 	case Kinder:
 		return v.Kind()
diff --git a/pkg/eval/vals/kind_test.go b/pkg/eval/vals/kind_test.go
index fc6ef612..8288b729 100644
--- a/pkg/eval/vals/kind_test.go
+++ b/pkg/eval/vals/kind_test.go
@@ -1,6 +1,7 @@
 package vals
 
 import (
+	"math/big"
 	"os"
 	"testing"
 
@@ -14,6 +15,9 @@ func TestKind(t *testing.T) {
 		Args(nil).Rets("nil"),
 		Args(true).Rets("bool"),
 		Args("").Rets("string"),
+		Args(1).Rets("number"),
+		Args(bigInt(z)).Rets("number"),
+		Args(big.NewRat(1, 2)).Rets("number"),
 		Args(1.0).Rets("number"),
 		Args(os.Stdin).Rets("file"),
 		Args(EmptyList).Rets("list"),