VoiceOver not reading the minus sign in Xcode

VoiceOver interprets a hyphen as a brief pause. That makes sense for hyphenated words, but it makes no sense for sums or for code. For example in Xcode this line


numberOfGuesses -= 1


is rendered as "number of guesses, equals one" by VoiceOver. That's terrible. How do I make VoiceOver behave sensibly for the minus sign in Xcode?


N.B. I have also posted this question here.

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