Actionscript :: Why Is DrawRoundRectComplex() Not Documented

in studying actionscript 3's graphics class, i've come across the undocumented drawRoundRectComplex() method. it's a variant of drawRoundRect() but with 8 parameters, the final four being the diameter of each corner (x, y, width, height, top left, top right, bottom left, bottom right).

//example
var sp:Sprite = new Sprite();
sp.graphics.lineStyle(1, 0x000000);

[Code]...

this seems to be a pretty useful method, so i'm just curious if anyone knows of any reasons why adobe chose not to document it?