Merge pull request #801 from dtolnay/negative0

Parse -0 as float -0.0 instead of integer 0

Author: dtolnay

src/de.rs

@@ -434,8 +434,8 @@ impl<'de, R: Read<'de>> Deserializer<R> {
                 } else {
                     let neg = (significand as i64).wrapping_neg();
 
-                    // Convert into a float if we underflow.
-                    if neg > 0 {
+                    // Convert into a float if we underflow, or on `-0`.
+                    if neg >= 0 {
                         ParserNumber::F64(-(significand as f64))
                     } else {
                         ParserNumber::I64(neg)

tests/test.rs

@@ -805,6 +805,7 @@ fn test_parse_u64() {
 #[test]
 fn test_parse_negative_zero() {
     for negative_zero in &[
+        "-0",
         "-0.0",
         "-0e2",
         "-0.0e2",