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@@ -10,13 +10,14 @@ module ActiveSupport #:nodoc:
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       module Except
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         # Returns a new hash without the given keys.
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         def except(*keys)
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-          rejected = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
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-          reject { |key,| rejected.include?(key) }
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+          clone.except!(*keys)
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         end
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         # Replaces the hash without only the given keys.
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         def except!(*keys)
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-          replace(except(*keys))
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+          keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
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+          keys.each { |key| delete(key) }
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+          self
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         end
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       end
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     end