Specs are failing; can't increment or decrement non-numeric value

[dball]

Using rails-2.3.5 and friends:

MemCache::MemCacheError in 'Cash::Accessor#incr when there is a cache hit increments the value of the cache'
cannot increment or decrement non-numeric value
./spec/cash/accessor_spec.rb:85:

MemCache::MemCacheError in 'Cash::Accessor#incr when there is a cache hit returns the new cache value'
cannot increment or decrement non-numeric value
./spec/cash/accessor_spec.rb:90:

MemCache::MemCacheError in 'Cash::Transactional Basic Operations increments through the real cache'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:24:

MemCache::MemCacheError in 'Cash::Transactional Basic Operations decrements through the real cache'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:32:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction Increment and Decrement#incr works'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:134:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction Increment and Decrement#incr is buffered'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:141:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction Increment and Decrement#decr works'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:162:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction Increment and Decrement#decr is buffered'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:169:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction Increment and Decrement#decr bottoms out at zero'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:187:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction#incr increment be atomic'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:342:
./spec/cash/transactional_spec.rb:340:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction#incr interleaved, etc. increments and sets be ordered'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:350:

MemCache::MemCacheError in 'Cash::Transactional In a Transaction#decr decrement be atomic'
cannot increment or decrement non-numeric value
./spec/cash/transactional_spec.rb:365: