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PiecewiseExpand problem.


I am puzzled by the behavior of PiecewiseExpand.  In its simplest version,
my question is this:

In 1:  PiecewiseExpand[UnitStep[x]]

Out 1:  1  x >= 0

Are we to assume from "Out 1" that UnitStep[x] for x < 0 is zero?
And note the following:

In 1:  PiecewiseExpand[UnitStep[x],x < 0]

Out 2:  0

By the way,  PiecewiseExpand[UnitStep[x], -1 < x < 1] returns the
same value as "Out 1".

Jack


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