Year 1900 bug

Greetings!

I am sweeping the draft for application/implementation -> evaluator 
purposes and encountered:

> Applications *may* reproduce the 1900-as-leap-year bug for 
> compatibility purposes, but *should not*.
>
I suppose it is the combination of a permission with a recommendation 
against following that permission that strikes me as odd.

Perhaps better:

"Applications should reproduce the 1900-as-leap-year bug for 
compatibility purposes only."

Yes?

Hope everyone is having a great weekend!

Patrick

-- 
Patrick Durusau

Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)