[Rd] NULL == NULL

[Martin Maechler]

gives an error in R.

In both S+3 and S+5, it "works" by returning NULL or logical(0),
respectively.

As a consequence,

   all(x == y)

returns TRUE in Splus, when x <- y <- NULL
but gives an error in R.

Do we have a good reason *not* to return  logical(0) ?

Martin Maechler <maechler@stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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