We don't really need underline. And I don't
agree: people use * and / all
the time in
normal text, whereas ** and // are almost unheard of. Yes, if people are
going to
quote C comments, they'll have to escape it, but that's basically the case
now anyway with an empty string in Pascal etc. Let's not be biased towards
quoting
source code. And let's minimise the amount of escaping needed.
// appears in every single URL. It might be possible to have the
parser recognise urls and automatically escape the token, but it's a
definite complication.