When playing around with iCloud, I have found out that they use the whole line of the structured name (N) as the display name for groups. So, this group:

VERSION:3.0
X-ADDRESSBOOKSERVER-KIND:group
FN:My Group
N:My Group,,,,

will be shown as "My Group,,,,". While this is clearly an iCloud bug, I wonder whether it might be possible to just generate the actually used components, for example N:My Group instead of N:My Group,,,, when only the family name is set. See also the first example in RFC 2426 3.1.2 where the Honorific Suffixes are left out without a trailing ;:

N:Public;John;Quinlan;Mr.;Esq.

instead of

N:Public;John;Quinlan;Mr.;Esq.;

This should be applicable to other structured fields too and could reduce the complexity (and size) of generated VCards.