st: inrange() function

["Nick Winter" <nwinter@policystudies.com>]

Greetings,

I just noticed that 

	inrange(a,b,c)

is *not* an exact synonym for the expression

	a>=b & a<=c

when a is missing.  The inrange() expression returns zero whenever a is
missing, so

	inrange(.b,.a,.c)

is 0, not 1 as I would have expected.  Similarly, inrange(.,0,.z) is 0,
and so on...

This seems weird to me . . .

Nick Winter
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