The issue w/ calling it "config" is that you end up with the confusing scenario where "config" is the object and "Config" is the type, differing only in casing.
Sorry. To clarify: it's not that I'm confused by the distinction between capitalized vs uncapitalized, it's that visually, "config" and "Config" look quite similar at a glance, whereas "c" and "Config" are clearly visually distinct.