How to determine whether an option is boolean?

Hi!

Some vim options are boolean, i.e. integers with the possible values 0 and 1. You can, e.g., set `ai` and `noai` or use `let &ai = 1`. Other options are numeric/integer or string values.

type(&option) can only be used to distinguish string from bool/int options. exist('&noai') returns 0, so it cannot be used to distinguish bool from int options. Is there another way to determine whether an option is a bool (an int that takes only the values 0 or 1) or an int?

Regards,
Tom

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