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H A De_exp.Sdiff 151879 Sun Oct 30 12:21:02 MST 2005 bde Fixed some comments added in rev.1.5.

The log message for 1.5 said that some small (one or two ulp) inaccuracies
were fixed, and a comment implied that the critical change is to switch
the rounding mode to to-nearest, with a switch of the precision to
extended at no extra cost. Actually, the errors are very large (ucbtest
finds ones of several hundred ulps), and it is the switch of the
precision that is critical.

Another comment was wrong about NaNs being handled sloppily.

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