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Forked from cmucl / cmucl
4398 commits behind the upstream repository.
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rtoy authored
computing the union of a bunch of disjoint integer types, usually from
some DO loop.  This fix implements a hack to short-circuit that case
by checking to see if the union is long enough and instead of
returning the precise union, we return the smallest interval that
contains all of the integer types in the union.  The max length of the
union is set by *union-length-threshold*, defaulting to 50.

This is a gross hack.  We should do something better than this.
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