The MergeInitializer is a super-simple mixin that allows you to initialize a subclass of Hash with another Hash to give you faster startup time for Hash subclasses. Note that you can still provide a default value as a second argument to the initializer.
@example
class MyHash < Hash include Hashie::Extensions::MergeInitializer end h = MyHash.new(:abc => 'def') h[:abc] # => 'def'
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