rails/rails — comment on commit 4bf516e072f5279bdb462c6592e17b195fd9cf05
File: activesupport/lib/active_support/cache.rb line 83
By exviva:

Not 100% sure yet, but I think this causes a bug where the `cache_key` method is never called if `key` is a 1-element array of something that **does** respond to `cache_key`.

Will provide a patch later today.