Excel compatibility: MATH: FLOOR and CEILING allow negative operands in Excel
header only issue,
Excel '=floor( -3.5, 0.4 )' -> -3.6, gnumeric -> #NUM!,
Excel '=ceiling( -3.5, 0.4 )' -> -3.2, gnumeric -> #NUM!,
and to add to the confusion Excel has additional functions FLOOR.PRECISE, FLOOR.MATH, CEILING.PRECISE, CEILING.MATH, see e.g.
https://support.microsoft.com/en-us/office/floor-precise-function-f769b468-1452-4617-8dc3-02f842a0702e,
#224 and
https://mail.gnome.org/archives/gnumeric-list/2022-September/msg00006.html .
Edited by b. s.