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Arry leaders & structs

I am using defstruct to define a 1-d bit array with a leader.  I ran into
some problems because the first position of the leader is interpreted as
the fill-pointer by some primitives such as bit-vector-cardinality.  I
changed the defstruct so that the fill-pointer position is unused (by me)
and always contains a nil.  Will this force all the bit primitivies to
use the actual array length?  If not, must I stuff the fill-pointer
position with the array length?

Jeff Barnett