Size mismatch should state expected size in bytes

[RalphCorderoy]

On a size mismatch, I'd like to know the size expected in bytes so I can compare against the actual size. The first example output is too vague, the second redundantly precise. I suggest 1,234,567 B output format.

size mismatch (expected 1.37 M)
size mismatch (expected 994.00 B)