<<Please don't reopen this bug...>> I would not dream of it. Let me only
record a possible misunderstanding. My report is not about that Excel
"optimization" by which near-cancellations are replaced by exact
cancellations; I mentioned that optimization only peripherally because
it affects the diagnostics. Instead, my report concerns the arithmetic
of the Excel and LibreOffice Calc rounding functions, by which "round to
integer" of an exactly representable (IEEE-754) integer may return a
different integer. In a way it is the opposite of the mentioned
optimization. It replaces exact equality (which would be the correct
mathematical result) by only approximate equality. It is indeed a tiny
error, only about 6 bits in the mantissa in the worst case. It is just
barely large enough to exceed the 5 bits of error that would be masked
by that Excel optimization.

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https://bugs.launchpad.net/bugs/1261048

Title:
  [Upstream] Wrong results from rounding functions for large argument

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