Number prop: validate in normalize

grimreaper → credited pdureau → .

Shown to @pdureau before creating the issue.

To you Mikael ;)

hello, MR is red (phpmd) and also the tests need to be done after casting the values?

There is a PHPMD issue

Mikael forgot to assign the ticket back

PHPMD fixed.

I don't think this should be done after casting the value.

i just added some tests to this MR.
if all tests are green, i will merge