ActiveSupport::BasicObject
# File lib/action_mailer/base.rb, line 456 def []=(key, value) unless value.is_a?(::String) ::ActiveSupport::Deprecation.warn("Using a non-String object for a header's value is deprecated. " "You specified #{value.inspect} (a #{value.class}) for #{key}", caller) value = value.to_s end @message[key] = value end
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