normalize_yaml_input

# File lib/rubygems/specification.rb, line 1221
  def self.normalize_yaml_input(input)
    result = input.respond_to?(:read) ? input.read : input
    result = "--- " + result unless result =~ /\A--- /
    result = result.dup
    result.gsub!(/ !!null \n/, " \n")
    # date: 2011-04-26 00:00:00.000000000Z
    # date: 2011-04-26 00:00:00.000000000 Z
    result.gsub!(/^(date: \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+?)Z/, '\1 Z')
    result
  end