diff --git a/run/resourcepacks/testpack/assets/minecraft/langer/en_us.json.rpo b/run/resourcepacks/testpack/assets/minecraft/langer/en_us.json.rpo
index ebb456f..72d43b0 100644
--- a/run/resourcepacks/testpack/assets/minecraft/langer/en_us.json.rpo
+++ b/run/resourcepacks/testpack/assets/minecraft/langer/en_us.json.rpo
@@ -2,14 +2,10 @@
   "conditions": [
     "lumi:subcategoryTest.enableLang",
     {
-      "not": [
-        "subcategoryTest.enableLangForceDisable"
-      ]
+      "not": "subcategoryTest.enableLangForceDisable"
     }
   ],
-  "fallbacks": [
-    "assets/minecraft/lang/en_us_joke.json"
-  ],
+  "fallback": "assets/minecraft/lang/en_us_joke.json",
   "expansions": {
     "Lights": "{lumi.subcategoryTest.enableLang}",
     "Mode": "{lumi.debugMode}",
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/RpoModInfo.java b/src/main/java/io/gitlab/jfronny/respackopts/RpoModInfo.java
index 4ce0a54..447d884 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/RpoModInfo.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/RpoModInfo.java
@@ -34,9 +34,10 @@ public class RpoModInfo {
                 .registerTypeAdapter(ConfigBooleanEntry.class, new BooleanEntrySerializer())
                 .registerTypeAdapter(ConfigBranch.class, new ConfigBranchSerializer())
                 .registerTypeAdapter(Script.class, new ScriptDeserializer())
-                .registerTypeAdapter(FileRpo.class, new RpoDeserializer())
+                .registerTypeAdapter(FileRpo.class, new FileRpoDeserializer())
                 .registerTypeAdapter(DirRpo.class, new DirRpoDeserializer())
                 .registerTypeAdapter(Condition.class, new ConditionDeserializer())
+                .registerTypeAdapterFactory(new SingleElementSetTypeAdapterFactory())
                 .setPrettyPrinting()
                 .create();
         try {
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/data/FileRpo.java b/src/main/java/io/gitlab/jfronny/respackopts/data/FileRpo.java
index b485049..d06ed18 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/data/FileRpo.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/data/FileRpo.java
@@ -3,11 +3,11 @@ package io.gitlab.jfronny.respackopts.data;
 import io.gitlab.jfronny.respackopts.data.condition.Condition;
 import meteordevelopment.starscript.Script;
 
-import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 public class FileRpo {
     public Condition conditions;
-    public List<String> fallbacks;
+    public Set<String> fallbacks;
     public Map<String, Script> expansions;
 }
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/filters/util/FileFallbackProvider.java b/src/main/java/io/gitlab/jfronny/respackopts/filters/util/FileFallbackProvider.java
index 2d9f7b2..7061a0a 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/filters/util/FileFallbackProvider.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/filters/util/FileFallbackProvider.java
@@ -8,14 +8,12 @@ import net.minecraft.util.Identifier;
 
 import java.io.InputStream;
 import java.util.Collection;
-import java.util.List;
 
 public class FileFallbackProvider {
     public static boolean fileVisible(WrappedPack pack, String name) {
         return FileRpoSearchProvider.modifyWithRpo(name, pack, rpo -> {
             if (rpo.fallbacks != null) {
-                List<String> arr = rpo.fallbacks;
-                for (String s : arr) {
+                for (String s : rpo.fallbacks) {
                     ResourcePath tmp = new ResourcePath(s);
                     if (pack.contains(tmp.getType(), tmp.getId()))
                         return true;
@@ -29,8 +27,7 @@ public class FileFallbackProvider {
         return FileRpoSearchProvider.modifyWithRpo(name, pack, rpo -> {
             try {
                 if (rpo.fallbacks != null) {
-                    List<String> arr = rpo.fallbacks;
-                    for (String s : arr) {
+                    for (String s : rpo.fallbacks) {
                         ResourcePath tmp = new ResourcePath(s);
                         if (pack.contains(tmp.getType(), tmp.getId()))
                             return pack.open(tmp.getType(), tmp.getId());
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/gson/DirRpoDeserializer.java b/src/main/java/io/gitlab/jfronny/respackopts/gson/DirRpoDeserializer.java
index e628c43..b5836d1 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/gson/DirRpoDeserializer.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/gson/DirRpoDeserializer.java
@@ -15,19 +15,15 @@ public class DirRpoDeserializer implements JsonDeserializer<DirRpo> {
         DirRpo rpo = new DirRpo();
         for (Map.Entry<String, JsonElement> entry : json.getAsJsonObject().entrySet()) {
             switch (entry.getKey()) {
-                case "conditions":
-                case "condition":
-                    rpo.conditions = context.deserialize(entry.getValue(), Condition.class);
-                    break;
-                case "fallbacks":
-                case "fallback":
+                case "conditions", "condition" -> rpo.conditions = context.deserialize(entry.getValue(), Condition.class);
+                case "fallbacks", "fallback" -> {
                     if (entry.getValue().isJsonPrimitive() && entry.getValue().getAsJsonPrimitive().isString()) {
                         rpo.fallback = entry.getValue().getAsString();
                     }
                     else {
                         throw new JsonParseException("Directory .rpos only support a single fallback");
                     }
-                    break;
+                }
             }
         }
         return rpo;
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/gson/FileRpoDeserializer.java b/src/main/java/io/gitlab/jfronny/respackopts/gson/FileRpoDeserializer.java
new file mode 100644
index 0000000..430245e
--- /dev/null
+++ b/src/main/java/io/gitlab/jfronny/respackopts/gson/FileRpoDeserializer.java
@@ -0,0 +1,30 @@
+package io.gitlab.jfronny.respackopts.gson;
+
+import com.google.gson.*;
+import com.google.gson.reflect.TypeToken;
+import io.gitlab.jfronny.respackopts.data.FileRpo;
+import io.gitlab.jfronny.respackopts.data.condition.Condition;
+import meteordevelopment.starscript.Script;
+
+import java.lang.reflect.Type;
+import java.util.Map;
+import java.util.Set;
+
+public class FileRpoDeserializer implements JsonDeserializer<FileRpo> {
+    private static final Type stringScriptMapType = new TypeToken<Map<String, Script>>(){}.getType();
+    private static final Type stringSetType = new TypeToken<Set<String>>(){}.getType();
+    @Override
+    public FileRpo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+        if (!json.isJsonObject())
+            throw new JsonParseException("Rpo must be a json object");
+        FileRpo rpo = new FileRpo();
+        for (Map.Entry<String, JsonElement> entry : json.getAsJsonObject().entrySet()) {
+            switch (entry.getKey()) {
+                case "conditions", "condition" -> rpo.conditions = context.deserialize(entry.getValue(), Condition.class);
+                case "fallbacks", "fallback" -> rpo.fallbacks = context.deserialize(entry.getValue(), stringSetType);
+                case "expansions", "expansion" -> rpo.expansions = context.deserialize(entry.getValue(), stringScriptMapType);
+            }
+        }
+        return rpo;
+    }
+}
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/gson/RpoDeserializer.java b/src/main/java/io/gitlab/jfronny/respackopts/gson/RpoDeserializer.java
deleted file mode 100644
index ea0aa20..0000000
--- a/src/main/java/io/gitlab/jfronny/respackopts/gson/RpoDeserializer.java
+++ /dev/null
@@ -1,46 +0,0 @@
-package io.gitlab.jfronny.respackopts.gson;
-
-import com.google.gson.*;
-import com.google.gson.reflect.TypeToken;
-import io.gitlab.jfronny.respackopts.data.FileRpo;
-import io.gitlab.jfronny.respackopts.data.condition.Condition;
-import meteordevelopment.starscript.Script;
-
-import java.lang.reflect.Type;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-
-public class RpoDeserializer implements JsonDeserializer<FileRpo> {
-    @Override
-    public FileRpo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
-        if (!json.isJsonObject())
-            throw new JsonParseException("Rpo must be a json object");
-        FileRpo rpo = new FileRpo();
-        for (Map.Entry<String, JsonElement> entry : json.getAsJsonObject().entrySet()) {
-            switch (entry.getKey()) {
-                case "conditions":
-                case "condition":
-                    rpo.conditions = context.deserialize(entry.getValue(), Condition.class);
-                    break;
-                case "fallbacks":
-                case "fallback":
-                    if (entry.getValue().isJsonPrimitive() && entry.getValue().getAsJsonPrimitive().isString()) {
-                        rpo.fallbacks = new ArrayList<>();
-                        rpo.fallbacks.add(entry.getValue().getAsString());
-                    }
-                    else {
-                        Type listType = new TypeToken<List<String>>(){}.getType();
-                        rpo.fallbacks = context.deserialize(entry.getValue(), listType);
-                    }
-                    break;
-                case "expansions":
-                case "expansion":
-                    Type listType = new TypeToken<Map<String, Script>>(){}.getType();
-                    rpo.expansions = context.deserialize(entry.getValue(), listType);
-                    break;
-            }
-        }
-        return rpo;
-    }
-}
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/gson/SingleElementSetTypeAdapterFactory.java b/src/main/java/io/gitlab/jfronny/respackopts/gson/SingleElementSetTypeAdapterFactory.java
new file mode 100644
index 0000000..bdad73e
--- /dev/null
+++ b/src/main/java/io/gitlab/jfronny/respackopts/gson/SingleElementSetTypeAdapterFactory.java
@@ -0,0 +1,66 @@
+package io.gitlab.jfronny.respackopts.gson;
+
+import com.google.gson.*;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import io.gitlab.jfronny.respackopts.RpoModInfo;
+
+import java.io.IOException;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+public class SingleElementSetTypeAdapterFactory implements TypeAdapterFactory {
+    @Override
+    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
+        Type type = typeToken.getType();
+        if (typeToken.getRawType() != Set.class
+            || !(type instanceof ParameterizedType pt))
+            return null;
+        if (RpoModInfo.CONFIG.debugLogs)
+            RpoModInfo.LOGGER.info("Using SingleElementSetTypeAdapter for " + typeToken.toString());
+        Type elementType = pt.getActualTypeArguments()[0];
+        TypeAdapter<?> elementAdapter = gson.getAdapter(TypeToken.get(elementType));
+        return (TypeAdapter<T>) createAdapter(elementAdapter);
+    }
+
+    private <T> TypeAdapter<Set<T>> createAdapter(final TypeAdapter<T> elementAdapter) {
+        return new TypeAdapter<>() {
+            @Override
+            public void write(JsonWriter out, Set<T> value) throws IOException {
+                if (value == null) {
+                    out.nullValue();
+                    return;
+                }
+
+                out.beginArray();
+                for (T entry : value) {
+                    elementAdapter.write(out, entry);
+                }
+                out.endArray();
+            }
+
+            @Override
+            public Set<T> read(JsonReader in) throws IOException {
+                if (in.peek() == JsonToken.NULL) {
+                    in.nextNull();
+                    return null;
+                }
+
+                Set<T> list = new LinkedHashSet<>();
+                if (in.peek() == JsonToken.BEGIN_ARRAY) {
+                    in.beginArray();
+                    while (in.hasNext()) {
+                        list.add(elementAdapter.read(in));
+                    }
+                    in.endArray();
+                }
+                else list.add(elementAdapter.read(in));
+                return list;
+            }
+        };
+    }
+}
diff --git a/src/test/java/io/gitlab/jfronny/respackopts/RespackoptsTest.java b/src/test/java/io/gitlab/jfronny/respackopts/RespackoptsTest.java
index 89b1810..7bb370f 100644
--- a/src/test/java/io/gitlab/jfronny/respackopts/RespackoptsTest.java
+++ b/src/test/java/io/gitlab/jfronny/respackopts/RespackoptsTest.java
@@ -1,5 +1,7 @@
 package io.gitlab.jfronny.respackopts;
 
+import com.google.gson.reflect.TypeToken;
+import io.gitlab.jfronny.respackopts.data.ConfigFile;
 import io.gitlab.jfronny.respackopts.data.entry.*;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;
@@ -8,6 +10,7 @@ import org.junit.jupiter.api.Test;
 
 import java.nio.file.Files;
 import java.nio.file.Paths;
+import java.util.Set;
 
 import static io.gitlab.jfronny.respackopts.Respackopts.*;
 import static io.gitlab.jfronny.respackopts.RpoModInfo.*;
@@ -22,6 +25,7 @@ class RespackoptsTest {
     static void initialize() {
         LOGGER.info("Expected error end");
         CONF_DIR = Paths.get("./test");
+        CONFIG = new ConfigFile();
         assertDoesNotThrow(() -> Files.deleteIfExists(CONF_DIR.resolve(testEntry1Name + ".json")));
         assertDoesNotThrow(() -> Files.createDirectories(CONF_DIR));
         SAVE_ACTIONS.add(() -> LOGGER.info("Save"));
@@ -94,4 +98,25 @@ class RespackoptsTest {
         cbNew.add(testEntryName, new ConfigBooleanEntry(true));
         cbNew.sync(cb, SyncMode.RESPACK_LOAD);
     }
+
+    @Test
+    void gsonSetOrder() {
+        String[] expected = new String[] {"one", "two", "three", "zero", "76"};
+        String gson = "[\"one\", \"two\", \"three\", \"zero\", \"76\"]";
+        Set<String> parsed = GSON.fromJson(gson, new TypeToken<Set<String>>(){}.getType());
+        int i = 0;
+        for (String s : parsed) {
+            assertEquals(s, expected[i++]);
+        }
+    }
+
+    @Test
+    void gsonSingleEntrySet() {
+        String gson = "\"someText\"";
+        Set<String> parsed = GSON.fromJson(gson, new TypeToken<Set<String>>(){}.getType());
+        assertEquals(parsed.size(), 1);
+        for (String s : parsed) {
+            assertEquals(s, "someText");
+        }
+    }
 }