fix(decode): let the later field win an equal-depth name clash

Assisted-by: GLM 5.3

decode.go

@@ -289,7 +289,7 @@ func newStructSchema(t reflect.Type) structSchema {
 				name = f.Name
 			}
 			key := strings.ToLower(name)
-			if existing, ok := s.byName[key]; !ok || depth < existing.depth {
+			if existing, ok := s.byName[key]; !ok || depth <= existing.depth {
 				s.byName[key] = structFieldLoc{index: path, depth: depth}
 			}
 		}