From 78333412a9b502ebd04306ecfd71b0db216d51c7 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Fri, 5 Dec 2025 12:54:11 +0100
Subject: io: print nans as NaN

---
 io.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/io.c b/io.c
index 1721f7b..6e1d425 100644
--- a/io.c
+++ b/io.c
@@ -291,6 +291,11 @@ putdouble(struct wbuf *buf, double x, vlong prec)
       x = -x;
    }
 
+   if (x != x) {
+      iowrite(buf, "NaN", 3);
+      return n + 3;
+   }
+
    x += 0.5 / prec;  // round last decimal
    if (x >= (double)(-1ULL>>1)) { // out of range?
       n += bwriteS(buf, "inf");
-- 
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