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by gavinballard 4842 days ago
I suspect that will be because the primary grid is now based on percentage values rather than fixed pixel values. When you're splitting a grid into columns using percentage widths, often the browser has to make a choice between rounding up or down to the closest pixel value for display.

The fluid grid has long been a part of Bootstrap, but until now has generally been secondary to the fixed 12-column grid, which used strict pixel values.