CEILING( x , significance ) doesn’t round negative numbers like some mathematical formulas (ex. Wolfram http://mathworld.wolfram.com/CeilingFunction.html) ; hence in risk of creating confusion. Insert a informative note to clarify any possible misunderstandings

Proposed Disposition of DIS 29500 Comment DK-0164 (Modified: 2007-11-24) We agree that, as defined, the CEILING function does not follow the generally accepted practice for negative numbers. However, in order to maintain compatibility with the corpus of existing documents that use the CEILING function and rely on its current behaviour, no change will be made to Part 4, §3.17.7.33 page 2,559. Similar Comments: AU-0030 , ECMA-0029 , MY-0015