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oleibman
5c6f2d0e34
Fix #4438. Do some optimization if Excel value is an integer. This is unlikely to make much of a difference, but the use case seems pretty common (cell represents a date rather than date-time), so we may as well do it. There had been no tests for negative integer values, because Excel does not handle those well, but OpenOffice and Gnumeric handle them just fine, so add some tests for them.