Manual style: "non-zero" vs "nonzero"

[Geert Bosch]

On Tue, 9 Oct 2001, Gerald Pfeifer wrote:
  In fact, I have now received mails (both to the list and privately) from
  native speakers that do prefer "non-zero" as well, and also google has
  twice as many hits for "non-zero" as it has for "nonzero", so it seems
  we really should standardize on "non-zero" instead.

The Ada standard for example, uses nonzero in preference over non-zero.
In the GNAT documentation, which will be contributed shortly, all but a
few occurrences used the version without the dash as well. (I now changed
it to use nonzero exclusively.)

  -Geert