fix(encode): keep a []any of tables in the value-array form

Assisted-by: GLM 5.3

encode.go

@@ -388,6 +388,13 @@ func addArrayValue(doc *tomlDoc, name string, v reflect.Value, ctx string) error
 			break
 		}
 	}
+	// A []any of tables is what Parse produces for a value array of inline
+	// tables; the [[header]] form would re-parse as []map[string]any and so
+	// change the value's Go type across a round-trip. The header form is
+	// reserved for typed table slices.
+	if v.Type().Elem().Kind() == reflect.Interface {
+		allTables = false
+	}
 	if allTables {
 		subs := make([]*tomlDoc, n)
 		for i := range n {