I re-tested again, just to make sure everything is "clean".
I used one of my forms. I added two TextField-s (using CNO Designer) to the bottom of my form (which uses BoxLayout Y), by clicking on the "Text Field" inside Core Components.
Then I clicked first of the two created text fields and changed the Constraint in "Properties" to Numeric and then the same on the second text field, but with the difference that I selected Decimal as the constraint. Everything else was left unchanged.
Then I saved the "*.res" file and executed "Send iOS Debug build" (btw. currently I am using your debug certificate for testing purposes).
After I installed the app on iOS. I went to that form and if I click on first text field, a numeric pad is opened and if I click on second text field a normal keyboard is opened.
Maybe some other user, which is currently working on some iOS stuff, can confirm or deny my findings (just to make sure).