diff --git a/bench/framework_test.go b/bench/framework_test.go
index c398c87..0427a99 100644
--- a/bench/framework_test.go
+++ b/bench/framework_test.go
@@ -119,7 +119,7 @@ func fixFloatsToInts(in interface{}) interface{} {
 		}
 		return out
 	case float64:
-		return int(in2)
+		return int64(in2)
 	default:
 		return in
 	}
diff --git a/bench/map_test.go b/bench/map_test.go
index 9bcb88c..f9f626d 100644
--- a/bench/map_test.go
+++ b/bench/map_test.go
@@ -24,14 +24,14 @@ var fixture_mapAlpha = map[string]interface{}{
 	},
 	"C": map[string]interface{}{
 		"N": "n",
-		"M": 13,
+		"M": int64(13),
 	},
 	"C2": map[string]interface{}{
 		"N": "n2",
-		"M": 14,
+		"M": int64(14),
 	},
-	"X": 1,
-	"Y": 2,
+	"X": int64(1),
+	"Y": int64(2),
 	"Z": "3",
 	"W": "4",
 }
diff --git a/obj/unmarshalBuiltins.go b/obj/unmarshalBuiltins.go
index ae79e25..c8a6528 100644
--- a/obj/unmarshalBuiltins.go
+++ b/obj/unmarshalBuiltins.go
@@ -159,9 +159,9 @@ func (mach *unmarshalMachinePrimitive) Step(_ *Unmarshaller, _ *unmarshalSlab, t
 		case TBool:
 			mach.rv.Set(reflect.ValueOf(tok.Bool))
 		case TInt:
-			mach.rv.Set(reflect.ValueOf(int(tok.Int))) // Unmarshalling with no particular type info should default to using plain 'int' whenever viable.
+			mach.rv.Set(reflect.ValueOf(int64(tok.Int))) // Unmarshalling with no particular target type info should consistently map into 'int64' to avoid passing on vagueries of codecs around numeric types.
 		case TUint:
-			mach.rv.Set(reflect.ValueOf(int(tok.Uint))) // Unmarshalling with no particular type info should default to using plain 'int' whenever viable.
+			mach.rv.Set(reflect.ValueOf(int64(tok.Uint))) // Unmarshalling with no particular target type info should consistently map into 'int64' to avoid passing on vagueries of codecs around numeric types.
 		case TFloat64:
 			mach.rv.Set(reflect.ValueOf(tok.Float64))
 		case TNull: