ActiveSupport::BasicObject
# File lib/action_mailer/base.rb, line 454 454: def []=(key, value) 455: unless value.is_a?(::String) 456: ::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) 457: 458: value = value.to_s 459: end 460: 461: @message[key] = value 462: end
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