module Hashie::Extensions::StrictKeyAccess

KeyError: key not found: "noes"
>> a["noes"]
=> {}
>> a = StrictKeyAccessHash.new(123)

With StrictKeyAccess:

=> 123
>> a["noes"]
=> {}
>> a = Hash.new(123)

Normal:

NOTE: When key lookup fails a KeyError is raised.
NOTE: Defaults don't make any sense with a StrictKeyAccess.

def [](key)
  fetch(key)
end