【Ruby】Rails/Sinatraを使わない場合のrbファイル実行時、i18nに`en is not a valid locale (I18n::InvalidLocale)'怒られる - Qiita

ruby $ ruby 202010270014.rb [WARNING] The default rounding mode will change from `ROUND_HALF_EVEN` to `ROUND_HALF_UP` in the next major release. Set it explicitly using `Money.rounding_mode=` to avoid potential problems. [DEPRECATION] You are using the default localization behaviour that will change in the next major release. Find out more - https://github.com/RubyMoney/money#deprecation Traceback