Les numéros alloués aux œuvres audiovisuelles sont ceux ayant les racines suivantes :

Racines (format national) 0ZABPQ = 01 99 00, 02 61 91, 03 53 01, 04 65 71, 05 36 49, 06 39 98

Therefore I use either of the following two approaches if I need a special value:

• I use null as a “switched off” value. (As an aside, this approach is relatively well supported by TypeScript.)
• I avoid both undefined and null via one of the techniques described above. This has the upside of being cleaner and the downside of involving more work.

A website search is often the first dynamic part you'll be adding to your new Jamstack project. Let’s see which solutions are available in the Jamstack world.