As a person with non-ASCII characters in name, i much prefer this approach than letting such characters pass but somehow fail on them later (which is not uncomm

As a person with non-ASCII characters in name, i much prefer this approach than letting such characters pass but somehow fail on them later (which is not uncommon e.g. in airplane tickets or hotel reservations). Unless a system is vetted to handle Unicode properly, it should just be upfront about that.