Serious rounding error
In Gnumeric 1.12.28 on FreeBSD 11.2-RELEASE; when I enter 0.02 into a cell in a new spreadsheet, it is displayed as 0.020000000000000001 (because binary floating-point, so that's ok), but when I hit Ctrl+Shift+4 to format it as currency, it rounded up and displayed as $0.03.
When displaying fewer decimals, I'd expect Gnumeric to round to nearest rather than always rounding up.
