I chose the name on purpose. The intent was to introduce this new option not only for getGroups but to also adopt other pieces of code bit by bit to use this option.

I guess using 500 groups is a good default though I think it won't help for default OpenLDAP installations:
According to [the docs](http://www.openldap.org/doc/admin24/limits.html#Per-Database%20Limits), 500 is the default overall size limit (hard limit). If more results are needed, *sizelimit* needs to be raised to include all results and *size.pr* must be set to the pagesize.