What character encoding do they use? ASCII is 7-bit, all those characters use 1 byte in ASCII, and of course email addresses were originally (and until recently?) restricted to ASCII.
Re:Helping a Million Developers Exit Vim
by Brotkrumen on Wednesday May 24, 2017 @04:01AM
(#14408274)
Something weird:
https://sds.sabre.com/XTRANET_Access/sabre.htm
The @ is 0x2E20 in sabre hex
In Sabre emails can be like 70 characters long. But periods count as two characters, as do underscores, and @ counts as four. I mean given the choice between period and cross of lorraine I know which I am choosing to include.