Well, '-bloom_overdrive 1.000000,1.000000,1.000000' is the same as the default (1.0,1.0,1.0), so it shouldn't be specified on the command line because there's no difference to the default value. This looks like a bug, however, it doesn't really hurt.

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]