From d2102b74bd7ae0b2651ff642160d9bbc1e9527a4 Mon Sep 17 00:00:00 2001
From: Leonard Ehrenfried <mail@leonard.io>
Date: Thu, 28 Mar 2024 14:42:20 +0100
Subject: [PATCH] Revert set conversion

---
 .../org/opentripplanner/openstreetmap/model/OSMWithTags.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/opentripplanner/openstreetmap/model/OSMWithTags.java b/src/main/java/org/opentripplanner/openstreetmap/model/OSMWithTags.java
index 5cf5ce52a2f..51bc9da1dd8 100644
--- a/src/main/java/org/opentripplanner/openstreetmap/model/OSMWithTags.java
+++ b/src/main/java/org/opentripplanner/openstreetmap/model/OSMWithTags.java
@@ -533,7 +533,7 @@ public Set<String> getMultiTagValues(Set<String> refTags) {
       .flatMap(v -> Arrays.stream(v.split(";")))
       .map(String::strip)
       .filter(v -> !v.isBlank())
-      .collect(Collectors.toSet());
+      .collect(Collectors.toUnmodifiableSet());
   }
 
   public OsmProvider getOsmProvider() {