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Commands are massive 500 byte objects, re-allocating this vector while recording them can actually add a substantial amount of overhead to applications with lots of drawing commands. Sizing to npot so that underestimating by a few commands doesn't force us to immediately copy all command objects. This is still a herustic driven approach. An alternative exact approach would have entities/contents describe how many commands they would add. This may be more important for stencil then cover (depending on how we do it) since some contents would need to create two commands.