class ActionView::LookupContext::DetailsKey

def self.details_cache_key(details)
  @details_keys.fetch(details) do
    if formats = details[:formats]
      unless Template::Types.valid_symbols?(formats)
        details = details.dup
        details[:formats] &= Template::Types.symbols
      end
    end
    @details_keys[details] ||= TemplateDetails::Requested.new(**details)
  end
end