negative zero test and fix (#1069)

Author: eleumik

gson/src/main/java/com/google/gson/stream/JsonReader.java

@@ -728,7 +728,7 @@ private int peekNumber() throws IOException {
     }
 
     // We've read a complete number. Decide if it's a PEEKED_LONG or a PEEKED_NUMBER.
-    if (last == NUMBER_CHAR_DIGIT && fitsInLong && (value != Long.MIN_VALUE || negative)) {
+    if (last == NUMBER_CHAR_DIGIT && fitsInLong && (value != Long.MIN_VALUE || negative) && (value!=0 || false==negative)) {
       peekedLong = negative ? value : -value;
       pos += i;
       return peeked = PEEKED_LONG;

gson/src/test/java/com/google/gson/stream/JsonReaderTest.java

@@ -560,6 +560,18 @@ public void testLongLargerThanMinLongThatWrapsAround() throws IOException {
     } catch (NumberFormatException expected) {
     }
   }
+  
+  /**
+   * Issue 1053, negative zero.
+   * @throws Exception
+   */
+  public void testNegativeZero() throws Exception {
+	  	JsonReader reader = new JsonReader(reader("[-0]"));
+	    reader.setLenient(false);
+	    reader.beginArray();
+	    assertEquals(NUMBER, reader.peek());
+	    assertEquals("-0", reader.nextString());
+  }
 
   /**
    * This test fails because there's no double for 9223372036854775808, and our