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issue BOGUS-FIXNUMS (initial draft)

It is not uncommon for a program to find itself with an object which is known
to be either a small integer or, say, a string or a list.  In such cases
(typep x 'fixnum) is likely to more efficient than either (typep x 'integer)
or (typep x '(integer 0 1000)), and it's an optimization that a compiler can't
do for you.