class ExecJS::RubyRhinoRuntime::Context

def unbox(value)
  case value = ::Rhino::to_ruby(value)
  when Java::OrgMozillaJavascript::NativeFunction
    nil
  when Java::OrgMozillaJavascript::NativeObject
    value.inject({}) do |vs, (k, v)|
      case v
      when Java::OrgMozillaJavascript::NativeFunction, ::Rhino::JS::Function
        nil
      else
        vs[k] = unbox(v)
      end
      vs
    end
  when Array
    value.map { |v| unbox(v) }
  else
    value
  end
end