Strange tests in Quesa

[Roger H. <rog...@mi...>]

Can anyone tell me why in E3GeometryNURBCurve.c there are a number of 
calls
to Q3_REQUIRE_OR_RESULT which seem to be very lax.

For instance in Q3NURBCurve_SetKnot there is a line:

	Q3_REQUIRE_OR_RESULT(Q3Object_IsType(curve, (kQ3ShapeTypeGeometry)), 
kQ3Failure);

The code then goes on to get the instance data of "curve" and uses as 
if were known to be
a NURBS Curve. Though it is likely the application programmer has 
called it with the a NURB
Curve, there does not seem to be anything to stop him passing any other 
geometry.

Is there any reason why I cannot change the line to test for 
kQ3GeometryTypeNURBCurve rather
than kQ3ShapeTypeGeometry?

Roger.