fix: pass original value to ParseTypeError in ArrayParameter and MapParameter

internal/util/parameters/parameters.go

@@ -1349,7 +1349,7 @@ func (p *ArrayParameter) IsExcludedValues(v []any) bool {
 func (p *ArrayParameter) Parse(v any) (any, error) {
 	arrVal, ok := v.([]any)
 	if !ok {
-		return nil, &ParseTypeError{p.Name, p.Type, arrVal}
+		return nil, &ParseTypeError{p.Name, p.Type, v}
 	}
 	if !p.IsAllowedValues(arrVal) {
 		return nil, fmt.Errorf("%s is not an allowed value", arrVal)
@@ -1574,7 +1574,7 @@ func (p *MapParameter) IsExcludedValues(v map[string]any) bool {
 func (p *MapParameter) Parse(v any) (any, error) {
 	m, ok := v.(map[string]any)
 	if !ok {
-		return nil, &ParseTypeError{p.Name, p.Type, m}
+		return nil, &ParseTypeError{p.Name, p.Type, v}
 	}
 	if !p.IsAllowedValues(m) {
 		return nil, fmt.Errorf("%s is not an allowed value", m)

internal/util/parameters/parameters_test.go

@@ -2324,3 +2324,31 @@ func TestCheckParamRequired(t *testing.T) {
 		})
 	}
 }
+
+// TestParseTypeErrorIncludesValue verifies that ArrayParameter.Parse and
+// MapParameter.Parse report the original input value in the error message, not
+// the zero value of the assertion target (nil) that is produced when a Go
+// two-result type assertion fails.
+func TestParseTypeErrorIncludesValue(t *testing.T) {
+	t.Run("ArrayParameter", func(t *testing.T) {
+		p := parameters.NewArrayParameter("arr", "test array", parameters.NewStringParameter("s", "item"))
+		_, err := p.Parse("not-an-array")
+		if err == nil {
+			t.Fatal("expected an error for wrong type, got nil")
+		}
+		if !strings.Contains(err.Error(), "not-an-array") {
+			t.Errorf("error should include the original value; got: %q", err.Error())
+		}
+	})
+
+	t.Run("MapParameter", func(t *testing.T) {
+		p := parameters.NewMapParameter("m", "test map", "string")
+		_, err := p.Parse("bad")
+		if err == nil {
+			t.Fatal("expected an error for wrong type, got nil")
+		}
+		if !strings.Contains(err.Error(), "bad") {
+			t.Errorf("error should include the original value; got: %q", err.Error())
+		}
+	})
+}