The offending line:

    command = "set #{cache_key} 0 #{expiry} #{value.size}\r\n#{value}\r\n"

The problem is the length part of the set command is done on it's pre-string form and not after conversion even though
it will be converted to a string before being sent to the server.

For example:
  CACHE.set('test', 1, 1, true)

  value.size == 1.size == 4
  value.to_s.size == 1.to_s.size == 1

  => set test 0 1 4 1

The server ends up waiting for 3 more bytes that never come.

Date: 2007-09-08 04:34
Sender: Eric Hodel

Ok, I will consider it.

Date: 2007-09-08 04:18
Sender: Elijah Miller

Since to_s is called on value already, is there any harm in
calling it before the size call?

I think this behavior is preferable to never returning
memcache calls. If you still disagree then I think these
methods should an error on non string values.

Date: 2007-09-08 03:43
Sender: Eric Hodel

It is not broken.  Raw mode is for String values only.  Don't
supply non-string values when raw is true.