OpenSSL::X509::Name::RFC2253DN#expand_pair

# File tmp/rubies/ruby-3.4.1/ext/openssl/lib/openssl/x509.rb, line 225
def expand_pair(str)
  return nil unless str
  return str.gsub(Pair){
    pair = $&
    case pair.size
    when 2 then pair[1,1]
    when 3 then Integer("0x#{pair[1,2]}").chr
    else raise OpenSSL::X509::NameError, "invalid pair: #{str}"
    end
  }
end