[squid-users] always_direct and never_direct

Hello all,

I saw this in the squid.conf file.

NOTE: There is a similar, but opposite option named
# 'never_direct'. You need to be aware that "always_direct deny
# foo" is NOT the same thing as "never_direct allow foo". You
# may need to use a deny rule to exclude a more-specific case of
# some other rule.

What exactly is the difference between "always_direct deny foo" and
"never_direct allow foo"? The first tells squid not to go directly to
foo what exactly is the latter saying?

Thanks!
Jeremy