There is much demand in templates to check if a given parameter is a number that can be used for calculations, cf. [[:de:Vorlage:IstZahl]]. Most template-only solutions have one or more weaknesses, and in the end, it should not be very performant either to do this check with templates.
So I propose a function #ifnumber that tests whether its parameter is a number. Even more useful would be a bunch of shortcuts to this new function and #expr tests: #ifinteger, #ifposnum, #ifposint, etc.
Version: unspecified
Severity: enhancement
URL: http://de.wikipedia.org/wiki/Vorlage:IstZahl