class Faraday::Retry::Middleware

def build_exception_matcher(exceptions)
  matcher = Module.new
  (
    class << matcher
      self
    end).class_eval do
    define_method(:===) do |error|
      exceptions.any? do |ex|
        if ex.is_a? Module
          error.is_a? ex
        else
          Object.const_defined?(ex.to_s) && error.is_a?(Object.const_get(ex.to_s))
        end
      end
    end
  end
  matcher
end