[Samba] username.map limitations

[Christian Merrill]

It's looking like there may be a 1024 character limit for each username 
map?  For example:

account1 = user1 user2 user3 user4 user5 (etc. etc. etc.) 

--After a certain point user accounts are not recognized as being part 
of the map.  Is this an intentional limitation, am I coming up against 
something else, has anyone else encountered this?  Using a semi-ugly 
workaround of creating additional local accounts and splitting the maps up.

Christian