Changes to a dupped `ActionController::Parameters` mutate the original
When `ActionController::Parameters` is duplicated with `#dup`, it doesn't create a duplicate of the instance variables (e.g. `@parameters`) but rather maintains the reference (see <http://ruby-doc.org/core-2.3.1/Object.html>). Given that the parameters object is often manipulated as if it were a hash (e.g. with `#delete` and similar methods), this leads to unexpected behaviour, like the following: ``` params = ActionController::Parameters.new(foo: "bar") duplicated_params = params.dup duplicated_params.delete(:foo) params == duplicated_params ``` This fixes the bug by defining a private `#initialize_copy` method, used internally by `#dup`, which makes a copy of `@parameters`.
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