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Vector coersion operator

When combining vectors of different length with a binary operator, the shorter vector is prepended with a vector of zeros to make the vectors the same length. Thus, for example,

        [a,b,c,d] * [e,f]

is equivalent to

        [a,b,c,d] * [0,0,e,f]

In general, if x and z are booleans, then

        (w :: x) * z = (w * 0) :: (x * z)
        x * (y :: z) = (0 * y) :: (x * z)

The exceptions to the above rule are

• the arithmetic operators,
• the comparison operators, and
• the conditional operator
• the union and ``in'' (set inclusion) operators