Accept -nan per the RESP3 spec recommendation.

For reference:
https://github.com/redis/redis-specifications/blob/master/protocol/RESP3.md

1 files changed, 2 insertions, 1 deletions

diff --git a/read.c b/read.c
index 8e6d21b..9c8f869 100644
--- a/read.c
+++ b/read.c
@@ -303,7 +303,8 @@ static int processLineItem(redisReader *r) {
                 d = INFINITY; /* Positive infinite. */
             } else if (len == 4 && strcasecmp(buf,"-inf") == 0) {
                 d = -INFINITY; /* Negative infinite. */
-            } else if (len == 3 && strcasecmp(buf,"nan") == 0) {
+            } else if ((len == 3 && strcasecmp(buf,"nan") == 0) ||
+                       (len == 4 && strcasecmp(buf, "-nan") == 0)) {
                 d = NAN; /* nan. */
             } else {
                 d = strtod((char*)buf,&eptr);