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str1 = "foo"
str2 = str1.dup
a1 = [ str1 ]
a2 = [ str2 ]
p a1.hash #=> 876516205
p a2.hash #=> 876516205

h1 = [ :foo => str1 ]
h2 = [ :foo => str2 ]
p h1.hash #=> 192302
p h2.hash #=> 192282