A semicircle shape gets exported as a circle in SVG
When I create a shape that is between a circle and a square, it is rendered as a circle in an SVG export, while a PNG export (via save for web) makes a good shape.
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 Anonymous
    
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      Konstantin H. commented I'm having the same issue. A temporary workaround is to select any anchor point on the path and cut the shape at this point. This way, a shape turns into a path, and Illustrator is not longer able to save it as a circle. This is suboptimal because you need to remember to do this cut when you do the export to SVG, which is a huge downside when you routinely deal with dozens of SVG images. 
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      Increasing 'Decimals' value does not help to get a proper result 
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      Ton commented See also these shapes that all become ovals 
 
           
              