just to get this straight: this is special casing CURRENT_TIMESTAMP b/c it's a magic constant in the Oracle grammar, and you don't want SQLT to quote it down the line? If that's the case, I don't know if this is the right place to take care of special casing it here. If you look at the SQLite parser, they special case it in the rule for `VALUE`, which makes more sense to me.

hey, why did you change this line? It looks to me like the way it's meant to be used is to passthrough args to SQLT::Diff, one arg of which is the args which are passed down to the inner SQLT instance

I don't think `warn` in tests is good practice?

I don't think it's good practice to leave slabs of commented code. If you want to delete it, delete it.

"CAlling" typo