fix(has): return false for negative array indices

The sequence branch only checked the upper bound (len > index), so has(-1) returned true even on an empty array. Guard index >= 0.

pkg/yqlib/operator_has.go

@@ -44,7 +44,7 @@ func hasOperator(d *dataTreeNavigator, context Context, expressionNode *Expressi
 				if errParsingInt != nil {
 					return Context{}, errParsingInt
 				}
-				candidateHasKey = int64(len(contents)) > number
+				candidateHasKey = number >= 0 && int64(len(contents)) > number
 			}
 			results.PushBack(createBooleanCandidate(candidate, candidateHasKey))
 		default:

pkg/yqlib/operator_has_test.go

@@ -71,6 +71,16 @@ var hasOperatorScenarios = []expressionScenario{
 			"D0, P[4], (!!bool)::true\n",
 		},
 	},
+	{
+		skipDoc:     true,
+		description: "Negative array index is never present",
+		document:    "[[1, 2, 3], []]",
+		expression:  `.[] | has(-1)`,
+		expected: []string{
+			"D0, P[0], (!!bool)::false\n",
+			"D0, P[1], (!!bool)::false\n",
+		},
+	},
 }
 
 func TestHasOperatorScenarios(t *testing.T) {