route -0 to double serializer to preserve sign bit on round-trip

Author: kirill-stepanishin

gremlin-javascript/src/main/javascript/gremlin-javascript/lib/structure/io/binary/internals/NumberSerializationStrategy.js

@@ -48,7 +48,8 @@ export default class NumberSerializationStrategy {
         Number.isNaN(item) ||
         item === Number.POSITIVE_INFINITY ||
         item === Number.NEGATIVE_INFINITY ||
-        !Number.isInteger(item)
+        !Number.isInteger(item) ||
+        Object.is(item, -0)
       ) {
         return this.ioc.doubleSerializer.serialize(item, fullyQualifiedFormat);
       }

gremlin-javascript/src/main/javascript/gremlin-javascript/test/unit/graphbinary/model-test.js

@@ -232,7 +232,7 @@ describe('GraphBinary v4 Model Tests', () => {
   runWriteRead('traversal-vertex');
 
   // runRead mode (6 entries)
-  runRead('neg-zero-double', negZeroComparator);
+  run('neg-zero-double', negZeroComparator);
   runRead('neg-zero-float', negZeroComparator);
   runRead('max-offsetdatetime', invalidDateComparator);
   runRead('min-offsetdatetime', invalidDateComparator);

gremlin-javascript/src/main/javascript/gremlin-javascript/test/unit/graphbinary/type-detection-test.js

@@ -73,6 +73,13 @@ describe('Type Detection Tests', () => {
       assert.strictEqual(anySerializer.serialize(-Infinity)[0], DataType.DOUBLE);
     });
 
+    it('-0 → DOUBLE (0x07) preserving sign', () => {
+      const result = anySerializer.serialize(-0);
+      assert.strictEqual(result[0], DataType.DOUBLE);
+      const deserialized = anySerializer.deserialize(result);
+      assert.isTrue(Object.is(deserialized.v, -0));
+    });
+
     it('BigInt within Int64 range → BIGINTEGER (0x23)', () => {
       assert.strictEqual(anySerializer.serialize(123n)[0], DataType.BIGINTEGER);
       assert.strictEqual(anySerializer.serialize(-456n)[0], DataType.BIGINTEGER);
@@ -318,13 +325,6 @@ describe('Type Detection Tests', () => {
       assert.isTrue(Number.isNaN(deserialized.v));
     });
 
-    it('-0 round-trip (loses sign)', () => {
-      const serialized = anySerializer.serialize(-0);
-      const deserialized = anySerializer.deserialize(serialized);
-      // -0 loses its sign through serialization, becomes +0
-      assert.strictEqual(deserialized.v, 0);
-    });
-
     it('complex nested structure', () => {
       const value = new Map([
         ['numbers', [1, 2.5, BigInt(123)]],