Kinda related, I always copy paste into a "simple" text editor before I copy paste into something else. Slack is so bad about having hidden characters I don't even want to think what other sites/programs do.
That's a great question. I would assume so since the whole point would be to strip out odd encodings. I don't have to do it often enough saved in going to assume that option will depend on the program/OS and if it supports it.