>> x = EmailAddress.find(1)
=> #<EmailAddress:0x3721ac0 @attributes={"name"=>nil, "updated_at"=>"2007-06-12 14:47:32", "crypt"=>"d4bf5ca873b0f2c0", "id"=>"1", "address"=>"eunji@deeptechinc.com", "created_at"=>"2007-06-12 14:47:32"}>
>> y = EmailAddress.find(1)
=> #<EmailAddress:0x371e258 @attributes={"name"=>nil, "updated_at"=>"2007-06-12 14:47:32", "crypt"=>"d4bf5ca873b0f2c0", "id"=>"1", "address"=>"eunji@deeptechinc.com", "created_at"=>"2007-06-12 14:47:32"}>
>> x == y
=> true
>> a = [x, y]
=> [#<EmailAddress:0x3721ac0 @attributes={"name"=>nil, "updated_at"=>"2007-06-12 14:47:32", "crypt"=>"d4bf5ca873b0f2c0", "id"=>"1", "address"=>"eunji@deeptechinc.com", "created_at"=>"2007-06-12 14:47:32"}>, #<EmailAddress:0x371e258 @attributes={"name"=>nil, "updated_at"=>"2007-06-12 14:47:32", "crypt"=>"d4bf5ca873b0f2c0", "id"=>"1", "address"=>"eunji@deeptechinc.com", "created_at"=>"2007-06-12 14:47:32"}>]
>> [x, y] == a
=> true
>> a.uniq
=> [#<EmailAddress:0x3721ac0 @attributes={"name"=>nil, "updated_at"=>"2007-06-12 14:47:32", "crypt"=>"d4bf5ca873b0f2c0", "id"=>"1", "address"=>"eunji@deeptechinc.com", "created_at"=>"2007-06-12 14:47:32"}>, #<EmailAddress:0x371e258 @attributes={"name"=>nil, "updated_at"=>"2007-06-12 14:47:32", "crypt"=>"d4bf5ca873b0f2c0", "id"=>"1", "address"=>"eunji@deeptechinc.com", "created_at"=>"2007-06-12 14:47:32"}>]