Created
October 19, 2009 22:36
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| $ irb | |
| >> 1.class | |
| => Fixnum | |
| >> 1.respond_to?(:dup) | |
| => true | |
| >> 1.dup | |
| TypeError: can't dup Fixnum | |
| from (irb):3:in `dup' | |
| from (irb):3 |
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