document bindparam() vs. literal()
I'm seeing a lot of SO answers come out doing this:
select([some_value).<someop> <something else>](bindparam('some_name',))
when they should be using
literal(). Let's beef up the docs for bindparam() and literal() to be fully cross-referenced and explain the difference. Let's also make this clear in
BindParam, that it really has these two public constructor functions.