generateSecret length param not working properly

[tbell511]

  const secret = speakeasy.generateSecret({
    issuer: 'My site',
    length: 32,
  });
  
  // secret -> HBWSKVZDKRPEU3T3G5HFI5CIKRNC4WSMN47T43SDNZKXGRCSNE4A

outputs a secret that has a length of 52

Adjusting the length down to 20 outputs a secret with a length of 32

  const secret = speakeasy.generateSecret({
    issuer: 'My site',
    length: 20,
  });
  
  // secret -> JBRHUZ2UPJ3X23LOEZKCMRDXER4VEVDF

[Levminer]

Hi!

Thanks for the report, I think this bug comes from the original library and fixing it might break existing code.

[hkjeffchan]

introduce a new parameter called "realLength"?