Fix 66 #72
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Fix 66 #72
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Fix for #66
There are no practical circumstances in Excel or the OpenXML spreadsheet format where storing -0.0 is meaningful or desirable. Excel does not distinguish between 0.0 and -0.0 - it always displays and stores zero as 0, regardless of sign. When you manually enter "-0.0" in Excel, it is stored as "0". The OpenXML specification does not require or support a distinction, and all major spreadsheet applications treat -0.0 as 0.0.
The "normalisation" fix included in the PR is not needed for decimal or integer types.