[Rails] Confusion with Hash duplicate key removal

Hi,

I have one basic question to ask regarding Hash key. Follow the below :

"foo".object_id # => 72994000
"foo".object_id # => 72993390
{"foo" =>2,"foo" =>3} # => {"foo"=>3}

I do know that Hash don't allow duplicate keys. But I would like to by
which method hash check if any duplicate key present into it or not? As
I can see "foo" have different `object_id`,which is expected. But in
case of Hash key how this two different objects "foo" is treated as same
object?

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