Blend modes and Setalpha

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I've put these in as bugs but I could have misunderstood something.
First (a good thing) Setalpha affects lightblend although it's not documented.
Second (a bad thing) Setalpha <= 0.5 will cause a maskblend image not to appear.
Graphics 640,480,0
Local img:TImage = LoadImage("b-max.png")
SetBlend maskblend
SetAlpha 0.5
DrawImage img,0,0
flip
WaitKey()