add support for grapheme clusters -----BEGIN SSH SIGNATURE----- U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAg4SS/1uClz0AafEK/1yprEhPh7s Se040sGiwv6eK2Wl4AAAADZ2l0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5 AAAAQCrBlgmbnB1Zx1cotZdh3apIUylL29Ohiyv8xY6pyydNDP41lqxPZwSoVPPAVIXkL7 l9mjs75qylLZ9v2XeT8Qk= -----END SSH SIGNATURE-----