What is the policy on quoting values in filters?  In the docs it seems that sometimes they are quoted and other times they are not.  For example, are these equivalent:

netmask (127.0.0.1/32) and netmask(“127.0.0.1/32”)

I think that maybe some filters, the ones that take strings essentially, are quoted, and not the ones that take numeric data.  Is that correct? 

Thanks,

-Mark