Public: A specialization of the Extension proxy that additionally stores a reference to the {Processor#process} method. By storing this reference, its possible to accomodate both concrete extension implementations and Procs.
# File lib/asciidoctor/extensions.rb, line 481 def initialize kind, instance, process_method = nil super kind, instance, instance.config @process_method = process_method || (instance.method :process) end