> In javascript you can use !! operator to always convert it to boolean.
>
> var name = ''
> var nameExists = !!(name || 'Prabir')
Yes, and I think we should do the same. It should already work like
that now.
Thus in most places where a condition is expected, such as with ":if"
and ":while", a boolean is expected. With legacy script you could use a
string, which was converted to a number and easily leads to mistakes.
Also numbers could be used. With Vim9 script only the numbers zero and
one can be used. This avoids making mistakes, but it's a bit strict.
The new "??" operator can be used with any expression. Just like with
"!" accepts any expression. In these places the expression is tested to
be "falsy" or "truthy".
I might have missed something, we might need a few more tests.
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