As I noted, 1.8.7 produces a hash collision for [2, 3] and [4, 5]. 1.9.1-p376 has exactly the same behavior. I reiterate: the Hash object is unreliable, regardl

As I noted, 1.8.7 produces a hash collision for [2, 3] and [4, 5]. 1.9.1-p376 has exactly the same behavior. I reiterate: the Hash object is unreliable, regardless of the runtime version. Based on such nasty behavior in such a simple case, I distrust Ruby's runtime and standard library for more complicated uses.