High precision floating point values are now properly sent to the Redis server.

Fixes #227

3 files changed, 15 insertions, 2 deletions

diff --git a/CHANGES b/CHANGES
index 9c13e03..86bf74a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -14,6 +14,8 @@
       Redis 2.6+ servers.
     * Added PEXPIRE/PEXPIREAT/PTTL commands. Thanks Luper Rouch.
     * Added INCRBYFLOAT/HINCRBYFLOAT commands. Thanks Nikita Uvarov.
+    * High precision floating point values won't lose their precision when
+      being sent to the Redis server. Thanks Jason Oster and Oleg Pudeyev.
 * 2.6.2
     * `from_url` is now available as a classmethod on client classes. Thanks
       Jon Parise for the patch.
diff --git a/redis/connection.py b/redis/connection.py
index 0322feb..118e99f 100644
--- a/redis/connection.py
+++ b/redis/connection.py
@@ -4,7 +4,7 @@ import socket
 import sys
 
 from redis._compat import (b, xrange, imap, byte_to_chr, unicode, bytes, long,
-                           BytesIO, nativestr)
+                           BytesIO, nativestr, basestring)
 from redis.exceptions import (
     RedisError,
     ConnectionError,
@@ -313,7 +313,9 @@ class Connection(object):
         "Return a bytestring representation of the value"
         if isinstance(value, bytes):
             return value
-        if not isinstance(value, unicode):
+        if isinstance(value, float):
+            value = repr(value)
+        if not isinstance(value, basestring):
             value = str(value)
         if isinstance(value, unicode):
             value = value.encode(self.encoding, self.encoding_errors)
diff --git a/tests/server_commands.py b/tests/server_commands.py
index d3616eb..dd32b19 100644
--- a/tests/server_commands.py
+++ b/tests/server_commands.py
@@ -1635,3 +1635,12 @@ class ServerCommandsTestCase(unittest.TestCase):
         data = ''.join(data)
         self.client.set('a', data)
         self.assertEquals(self.client.get('a'), b(data))
+
+    def test_floating_point_encoding(self):
+        """
+        High precision floating point values sent to the server should keep
+        precision.
+        """
+        timestamp = 1349673917.939762
+        self.client.zadd('a', 'aaa', timestamp)
+        self.assertEquals(self.client.zscore('a', 'aaa'), timestamp)