The properties page of "boolean array to number" must include the "sign extension mode" setting.

[altenbach]

(NOTE: This idea is the opposite of this one, so not the same)

The properties page of "boolean array to number" should prominently include the sign extension mode so we don't run into this confusion.

[altenbach]

I guess there are some rare edge cases where sign extension is useful. Still, I think "never" should probably be the default. Highly advanced programmers can always enable it if appropriate for their specific scenario.