I thought we agreed a long time ago neither not to check for either
overflows or underflows when ZORBA_WITH_BIG_INTEGER=OFF.

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https://bugs.launchpad.net/bugs/984031

Title:
  negative result for fib(95)

Status in Zorba - The XQuery Processor:
  New

Bug description:
  declare function local:fib($n as xs:integer) as xs:integer
  {
   if ($n eq 0) then 0
   else if ($n eq 1) then 1
   else local:fib($n - 1) + local:fib($n - 2)
  };

  local:fib(95)

  gives  -4953053512429003327 but should return 31940434634990099905.
  This seems to be a overflow in numerics. fib(90) gives the correct
  result.

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