todo list from bradfitz review func (cr *Context) ClipExtents() (float64, float64, float64, float64) named return params func (matrix *Matrix) InitIdentity() should be (m *Matrix) func (scaledFont *ScaledFont) GetFontOptions(options *FontOptions) options -> opts GetFoo() -> Foo() e.g. func (fontFace *ToyFontFace) GetWeight() FontWeight