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RadialGradient: raise a clear error for a negative or non-finite radius - #2135
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RadialGradient(30, 30, 0, 50, 50, -5, colors)wrote/Coords [30 30 0 50 50 -5]into the shading, and a NaN radius wrotenan. The PDF specification requires both radii to be zero or more, andshape_radial_gradient()already raisesValueErrorfor a negativer.RadialGradientnow raisesValueError: Gradient circle radius must be zero or a positive number: ...for a negative, NaN or infinite start or end radius. SVG gradients go throughshape_radial_gradient()and are unchanged.CHANGELOG.md