Lazy-require tzinfo for TimeZone

activesupport/lib/active_support/time_with_zone.rb

@@ -1,4 +1,5 @@
 require 'tzinfo'
+
 module ActiveSupport
   # A Time-like class that can represent a time in any time zone. Necessary because standard Ruby Time instances are
   # limited to UTC and the system's <tt>ENV['TZ']</tt> zone.

activesupport/lib/active_support/values/time_zone.rb

@@ -288,6 +288,7 @@ module ActiveSupport
 
     # TODO: Preload instead of lazy load for thread safety
     def tzinfo
+      require 'tzinfo' unless defined?(TZInfo)
       @tzinfo ||= TZInfo::Timezone.get(MAPPING[name])
     end