At Tampa Hard Rock, you have to double the straddle for a raise. The first time I played poker at a different casino, it was Harrah's Las Vegas. There was a straddle, and then a guy raised just the amount of the big blind, instead of double the straddle. I asked is that OK, and the dealer and all the players looked at me like I was an idiot. They all said "of course, the straddle is like a raise, not a blind".
Being the out of towner, I didn't push it any further, and didn't really care anyway, so I would never have thought to ask for a floor ruling. But there wasn't any doubt among the dealer and players that the straddle was a raise, and not a higher blind.
That was an interesting trip as I discovered all sorts of things that are different than the way poker was dealt at the Tampa Hard Rock (at the time). Like out of turn action was binding, and there was such a thing as reduced rake.