However, the init is not foolproof. For example, it has no effect in desk accessories. It also possible to type a space, type another character, delete this character, and then type a space again, resulting in two consecutive spaces. In addition, spaces entered from the clipboard are not screened out.
Because non-breaking spaces (entered with option-spacebar) do not have such an adverse affect on justified text and because they just seem to be special, the init does not screen them.
Finally, should there ever be a reason to type multiple, consecutive spaces — possibly, as a demonstration of how grotesque they are — the init offers the key combination command-shift-spacebar as a toggle switch.
