From 565f82a285787af7e02221fe15d9be8a6c793162 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Wed, 25 Oct 2023 20:47:40 -0700
Subject: [PATCH] Handle the possibility of f64::NAN being a negative NaN

---
 src/de.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/de.rs b/src/de.rs
index a4d0d3f..eda73d3 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -1121,13 +1121,13 @@ impl<'a> Deserializer<'a> {
             })
         } else if s == "nan" {
             Ok(Value {
-                e: E::Float(f64::NAN),
+                e: E::Float(f64::NAN.copysign(1.0)),
                 start,
                 end,
             })
         } else if s == "-nan" {
             Ok(Value {
-                e: E::Float(-f64::NAN),
+                e: E::Float(f64::NAN.copysign(-1.0)),
                 start,
                 end,
             })