with arithmetic sequences) also hold for the <tt/Enum/ instances
over the various <tt/Word/ types defined here.
+<item>
+Right and left shifts by amounts greater than or equal to the width of
+the type result in a zero result. This is contrary to the behaviour
+in C, which is undefined; a common interpretation is to truncate
+the shift count to the width of the type, for example <tt>1 <<
+32 == 1</tt> in some C implementations.
+
</itemize>
<bf/Implementation notes:/