ActiveSupport::Cache::MemCacheStore connection to MemCached becomes corrupted with invalid :expires_in

If the following code is run the first write succeeds, but the last two calls output an error in the logs:

Cache write: foo
Cache read: foo
Cache write: mynewfoo ({:expires_in=>"Mon Jun 29 13:10:40 -0700 2009"})
MemCacheError ():
Cache read: foo
MemCacheError ():

The invalid expires_in corrupts the connection to MemCache. The simplest fix to this would be to call reset on the connection to memcache and retrieve a new connection if a MemCache exception is rescued.

cache = ActiveSupport::Cache::MemCacheStore.new("localhost:11211")

cache.write("foo", "bar")

puts cache.read("foo").inspect # outputs foo

cache.write("mynewfoo", "blah", :expires_in => 'Mon Jun 29 13:10:40 -0700 2009')

puts cache.read("foo").inspect # outputs nil