Ruby Hash with duplicate keys?

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Two ways of achieving duplicate keys in a hash:

h1 = {}
h1.compare_by_identity
h1["a"] = 1
h1["a"] = 2
p h1 # => {"a"=>1, "a"=>2}


h2 = {}
a1 = [1,2,3]
a2 = [1,2]
h2[a1] = 1
h2[a2] = 2
a2 << 3 
p h2 # => {[1, 2, 3]=>1, [1, 2, 3]=>2}

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