class MultiJson::Adapter

def blank?(input)
  input.nil? || /\A\s*\z/ === input
rescue ArgumentError # invalid byte sequence in UTF-8
  false
end

def cached_dump_options(options)
  OptionsCache.fetch(:dump, options) do
    dump_options(options).merge(MultiJson.dump_options(options)).merge!(options)
  end
end

def cached_load_options(options)
  OptionsCache.fetch(:load, options) do
    load_options(options).merge(MultiJson.load_options(options)).merge!(options)
  end
end

def defaults(action, value)
  metaclass = class << self; self; end
  metaclass.instance_eval do
    define_method("default_#{action}_options") { value }
  end
end

def dump(object, options = {})
  instance.dump(object, cached_dump_options(options))
end

def load(string, options = {})
  string = string.read if string.respond_to?(:read)
  fail self::ParseError if blank?(string)
  instance.load(string, cached_load_options(options))
end