I disagree somewhat with:
Many guitars with humbuckers (such as my old Aria Pro guitar) have a switch called a coil tap which deactivates half of the humbucker, turning the guitar into a single-coil guitar with a flick of the switch. So I can go back and forth between single-coil and humbucker right in the middle of a song if I want to.
While it deactivates the electronics in one of the sets of pickups, thus reactivating the hum and deactivating the weird harmonic stuff it does, you still have those extra magnets there affecting the string. It does sound a lot like a single-coil pickup, but not exactly.
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Bitt Faulk