New numbering rules?

[Jon Stratis]

How are the new number rules any more specific than the old ones?

2014:

Team numbers must be displayed on the BUMPERS and meet the following criteria:
A. consist of numerals at least 4 in. high, at least ½ in. in stroke width, and be either white in color or outlined in
white,
B. may not wrap around a corner of the FRAME PERIMETER (for the purposes of R28 a round or circular FRAME
PERIMETER has no corners), and
C. be positioned around the ROBOT such that an observer walking around the perimeter of the ROBOT can
unambiguously tell the Team’s number from any point of view.

2015:

R2 Team numbers must be displayed on the ROBOT and meet
the following criteria:
A. consist of numerals at least 3.5 in. high, at least 0.5 in. in stroke width,
and be black in color with a white background extending at least 1 in.
from the edges of the numbering,
B. be positioned around the ROBOT such that an observer walking around
the perimeter of the ROBOT can unambiguously tell the Team’s number
from any point of view.

In both cases, height, stroke width, and positioning are defined. The only addition is the surrounded by white portion, which wasn't applicable when they were mounted on bumpers. So instead of standard size and colored background from the bumpers, they specify something new.