Remove method that produces error for prod(AbstractArray{Bool}).

[andreasnoack]

Fixes #14657

[tkelman]

could use a more direct test of this signature, particularly its return type

[andreasnoack]

Do you mean something like prod([true,true,true])===true?

[tkelman]

right. the bitunpack test would work if you check the return type.

I think this is borderline for backporting, it would be really easy to write code that doesn't work on early 0.4.x versions with this change.

[andreasnoack]

I've put the modified test back

it would be really easy to write code that doesn't work on early 0.4.x versions with this change.

Isn't that true for most bug fixes? Feel free to do what you think is best.

[tkelman]

Yes, but what I want to avoid is having Pkg.update() break users' code. So package authors need to be very careful with REQUIRE any time they add code that would fail on existing 0.4.x releases. Ideally packages would test against earlier point releases in addition to the latest. Upgrading julia between point releases is intended to be non breaking and easy to do, but might not always be under the user's control.