number(false) gives unexpected results

Can anyone tell me why  in this expression:
<img src="tab.{number(contains($input/@ACTIVE,@LABEL))}.gif" />
the evaluation comes out as:
tab.0.0000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000013310712
109329969.gif

when I evaluate 'contains($input/@ACTIVE,@LABEL)' it evaluates correctly
('true' or 'false'), but as soon as I use the number() function, I get this
result. The above number is a 'false' case; the true case ends in 83 instead
of 69. I am using Xalan and Xerces; is this a bug in the jars? I expect the
evaluation to be either '1' or '0'.

Cheers,
-m*

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