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This PR ought to be checked. I've copied and pasted it from Imagick, but it needs a second set of eyes on it.
Basically it 'fixes' the rounding to be what most people would expect, and should match the behaviour of CLI GraphicsMagick. Fixes #7
I put the legacy flag in there so that people who rely on the current behaviour don't get too upset. TBH, they should probably just resize the image directly themselves.