to reproduce:
Linux (WSL) | Windows

isn't limited to repl

There is another problem with the prompt, confirm and alert methods... they seem to not print correctly some characters (茫帽玫芒锚卯么没眉, for example)

It happens both on the alert/confirm/prompt message and on the return value. This does not happen on console.log, though.
deno 1.5.0
v8 8.7.220.3
typescript 4.0.3
If this is too unrelated to the main problem, I can open a new issue
As #8146 can probably be fixed with something similar to a simple trim method (maybe not?), and the problem I brought with special UTF-8 (or UTF-16?) probably isn't that simple, I'm opening a new issue.
Fixed by #8149
Most helpful comment
Fixed by #8149