Enable threadsafe! by default #6685

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@@ -56,7 +56,7 @@
# config.action_mailer.raise_delivery_errors = false
# Enable threaded mode.
- # config.threadsafe!
+ config.threadsafe!
# Enable locale fallbacks for I18n (makes lookups for any locale fall back to
# the I18n.default_locale when a translation can not be found).