class Gem::Specification

def sanitize_string(string)
  return string unless string
  # HACK the #to_s is in here because RSpec has an Array of Arrays of
  # Strings for authors.  Need a way to disallow bad values on gemspec
  # generation.  (Probably won't happen.)
  string = string.to_s
  begin
    Builder::XChar.encode string
  rescue NameError, NoMethodError
    string.to_xs
  end
end