Or maps a path prefix consisting exclusively of ones and zeroes to 1 if it contains at least one 1, and to 0 otherwise. The rest of the path is returned unchanged.
Or:
<> == 0 Idem
<1> == 1 Strip:<>
<0> == Or:<>.
Or:<1 0 0 1 0> = 1.
Or:<0 0 0 0 0> = 0.
Or:<1 1 0 1 1 foo 0> = 1 foo 0.
See the discussion of And, above, for the rationale for this semantics.
