I have a question about Section 10.4.6 of X.691

From the spec:

10.4.6 A minimum octed 2's-complement-binary-integer encoding of the whole number has a field-width that is a multiple of eight bits and also satisfies the condition that the leading nine bits of the field shall not all be zero and shall not all be ones.

Does 'leading nine bits' suggest that the minimum number of octets is 2?

How would, for example, -1 or 0 be encoded if all of the bits can not be 1 and can not all be 0?

 What am I missing?

Thanks,

-Adam Bozanich

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