Omit mapped size in identifier files

output_hashes.json

@@ -1,70 +1,70 @@
 {
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+    "object-hash": -1850665106,
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+    "object-hash": -1451839750,
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+    "object-hash": 766827418,
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+    "object-hash": 919790320,
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+    "object-hash": -1301227109,
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+    "object-hash": 483524585,
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+    "object-hash": -697884142,
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+    "object-hash": 928039847,
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+    "object-hash": -1194242262,
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+    "object-hash": 1947742501,
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+    "object-hash": -1436253462,
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+    "object-hash": 257878529,
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+    "object-hash": -165329112,
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@@ -160,7 +160,7 @@
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@@ -216,7 +216,7 @@
     "size": 94
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+    "object-hash": -395427113,
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   "1.20.5:1.21": {

src/main/java/com/viaversion/mappingsgenerator/MappingsOptimizer.java

@@ -553,8 +553,9 @@ public final class MappingsOptimizer {
         }
 
         // Use the same compact storage on the identifier->global identifier files, just about halves the size
-        // TODO Omit mapped size?
-        final MappingsResult result = MappingsLoader.map(identifiers, globalIdentifiersArray, null, errorStrategy);
+        // Remove mapped size to avoid unnecessary file changes
+        MappingsResult result = MappingsLoader.map(identifiers, globalIdentifiersArray, null, errorStrategy);
+        result = new MappingsResult(result.mappings(), -1, result.emptyMappings(), result.identityMappings(), result.shiftChanges());
         serialize(result, tag, key, true);
     }