diff --git a/internal/expr.go b/internal/expr.go
index e481268..a772bf1 100644
--- a/internal/expr.go
+++ b/internal/expr.go
@@ -454,10 +454,28 @@ func isTruthy(val any) bool {
 		return v
 	case int:
 		return v != 0
+	case int8:
+		return v != 0
+	case int16:
+		return v != 0
+	case int32:
+		return v != 0
 	case int64:
 		return v != 0
+	case uint:
+		return v != 0
+	case uint8:
+		return v != 0
+	case uint16:
+		return v != 0
+	case uint32:
+		return v != 0
+	case uint64:
+		return v != 0
 	case float64:
 		return v != 0
+	case float32:
+		return v != 0
 	case string:
 		return v != ""
 	case []any:
@@ -558,6 +576,16 @@ func toFloat64(val any) (float64, bool) {
 		return float64(v), true
 	case int32:
 		return float64(v), true
+	case int16:
+		return float64(v), true
+	case int8:
+		return float64(v), true
+	case uint32:
+		return float64(v), true
+	case uint16:
+		return float64(v), true
+	case uint8:
+		return float64(v), true
 	default:
 		return 0, false
 	}