[Rails] polymorphic_url

In polymorphic_routes.rb, polymorphic_url is defined in rails source
from github,and this particular line:

inflection = if options[:action] && options[:action].to_s == "new"
args.pop
:singular
elsif (record.respond_to?(:persisted?) && !record.persisted?)
args.pop
:plural
elsif record.is_a?(Class)
args.pop
:plural
else
:singular
end

what's the purpose of extracting last element of array here? At this
point args will either be an array of activerecord objects, or just be
a single activerecord object in an array.

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