another warning problem

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I wrote this route my equivalent to basic's VAL

global function getdec(sequence seq) --returns a decimal given a sequence
atom de
sequence value_string
  value_string=value(seq[1..length(seq)])
 de = value_string[2]
return de
end function

 In some programs I get warning: call to getdec() might be short circuited.
 This hasn't caused me any promlems. 
 What does it mean?
 Should I worry about it?

 Don Cole 
SF

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