I have some questions about the specification of bitwise-unfold.

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Generates a non-negative integer bit by bit, starting with bit 0. If the
result of applying stop? to the current state (whose initial value is
seed) is true,
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By "true", does it mean any value other than #f?  (I presume yes.)

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return the currently accumulated bits as an integer. Otherwise, apply
mapper to the current state to obtain the next bit of the result by
interpreting a true value as a 1 bit and a false value as a 0 bit.
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I presume the only "false value" is #f.

By "true value" does it mean anything other than #f?  Or does the result
need to be boolean, the value #t?

Thanks.

Brad