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Set JSON.parse returned object and array classes

By default, the Ruby JSON.parse method returns a ruby Hash for any json object, and a ruby Array for any json array.

However, you can customize the returned object classes using the object_class and array_class options:

source = JSON.dump({ wibble: "wubble", data: [1,2,3] })

result = JSON.parse(
  source, 
  object_class: OpenStruct,
  array_class: Set
)
# => #<OpenStruct wibble="wubble", data=#<Set: {1, 2, 3}>>

result.data # => #<Set: {1, 2, 3}>
result.wibble # => "wubble"
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