p:head and p:tail

Can we imagine to have negative values for count

In such a case

p:head with count < 0 is equivalent to have all the last |count|
documents of the sequence

p:tail with count < 0 is equivalent to have all but the first |count|
documents of the sequence

I have some use case where I want all but the last and the first
document of the sequence and don't want to go to p:matching-document
AND p:count

Mohamed
-- 
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