K 10
svn:author
V 3
das
K 8
svn:date
V 27
2011-10-16T05:37:01.852933Z
K 7
svn:log
V 134
Optimize the case of pure imaginary arguments.  Calls like this are
common, e.g., in DFT implementations.

Discussed with:	bde, kargl

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