256 can NOT be represented with 8 bits

That's the number of distinct values you get with 8 bits. Since there is no "zeroth" day of the year, it makes sense to have it on the 256th day instead of the 255th.

yep. I just commented on exact wiki words.

it's just not consistent. All current assignment "modifiers" are "binary" operators and ~ is unary one.

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