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hash of arrays, never again
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| 1.9.3-p327 :002 > a = {:b => [3,4,5]} | |
| => {:b=>[3, 4, 5]} | |
| 1.9.3-p327 :003 > b = a.dup | |
| => {:b=>[3, 4, 5]} | |
| 1.9.3-p327 :004 > b[:b] << 'asdf' | |
| => [3, 4, 5, "asdf"] | |
| 1.9.3-p327 :005 > a | |
| => {:b=>[3, 4, 5, "asdf"]} | |
| 1.9.3-p327 :006 > b | |
| => {:b=>[3, 4, 5, "asdf"]} | |
| 1.9.3-p327 :007 > | |
| a = {:b => [3,4,5]} | |
| b = a.dup | |
| b[:b] << 'asdf' | |
| a == b # should be false |
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