When using ?? in combination with || the necessary parentheses are removed

[limsbeheer]

NUglify version: 1.20.7
Reproduced in tiny console app in .NET 7.0

Describe the bug
When using ?? in combination with || the necessary parentheses are removed in the minified code.

To Reproduce
Uglify.Js("if ((a ?? b ?? c) || await d()) {}");

Minified output or stack trace
Output code: a??b??c||await d() which results in the JavaScript exception Uncaught SyntaxError: Unexpected token '||'.

Expected output code
(a??b??c)||await d()
The parentheses around a??b??c cannot be removed.

[trullock]

It's probably treating the operator precedence for ?? the same as ||.

You can easily change this, make a PR