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Did the Analytical Engine have a minus Zero in addition to a the normal (plus) zero?

In other words:

If two equal negative numbers were subtracted, was the result a positive zero, and the run-up lever set due to the rule that the signs differ?

Or was the run-up lever clear, and a negative zero produced?

Or was a (positve) zero produced, and the rule that the run-up lever set if the signs differ overridden, once the result is zero?