NurbsCurve floatArray “widths” values always exports as single constant values

[asims-al]

Describe the bug Upon export of a NurbsCurve with a widths floatArray, the data written out is always a single constant value:

float[] widths = [1] (
                interpolation = "constant"
            )

Perhaps this makes sense as a default if there is no widths on the curve, but not when a multi-valued floatArray data is present.

---

Steps to reproduce

1. Open the following nurbs_curve.ma (uploaded with ".txt" extension) Note:

   • we imported the NurbsCurve into Maya via AL plugin via the example.usa file mentioned on this issue: https://github.com/Autodesk/maya-usd/issues/3017
   • we have the correct values on our extra attribute

     import maya.cmds as cmds
     cmds.getAttr("example_curveShape.widths")
     # Result: [0.004000000189989805, 0.004000000189989805, 0.00800000037997961, ....
     cmds.getAttr("example_curveShape.widths", type=True)
     # Result: floatArray

2. Export with root selected

export_options = {
    "selection": True,
    'file': "export_path.usda",
}
cmds.mayaUSDExport(**export_options)

3. The exported usda will have:

   float[] widths = [1] (
               interpolation = "constant"
           )

   ---

Expected behavior For the width floatArray values to carry over to exported.

Specs (if applicable):

• Linux Centos 7.8
• Maya 2023.2.0-11.0.PFIX
• MayaUSD v0.23.0
• USD v21.8

[maya-usd-git-sync[bot]]

Issue synced internally to EMSUSD-768