Buzz, when you plot a logarithmic function on a logarithmic scale, it is a straight line. On a linear scale it is a curved line, but the function is the same.
A straight bar in curved space would still be straight in space, but it would be curving around from the reference of outside of space.
You're calling this bar "not absolutely straight" but you measure the straight-ness in regards to the space it occupies. Since it is space, itself, that is bent and not the bar, then the bar is striaght by any worthwhile definition even though it curves back onto itself.
You're just saying: "Nuh-uh, that's not a straight bar!" but you don't really have a basis for the claim. It s straight by any definition that anyone cares about. That you want to make up your own word just so you can claim irrefutability is rather lame, IMHO.