class Hash

def deep_stringify_keys

# => {"person"=>{"name"=>"Rob", "age"=>"28"}}
hash.deep_stringify_keys

hash = { person: { name: 'Rob', age: '28' } }

nested hashes and arrays.
This includes the keys from the root hash and from all
Returns a new hash with all keys converted to strings. 
def deep_stringify_keys
  deep_transform_keys(&:to_s)
end