skia.Path.ConvertConicToQuads() not working as expected

[justvanrossum]

Describe the bug
skia.Path.ConvertConicToQuads() does not appear to return the correct value.

To Reproduce
I translated this fiddle to Python:
https://fiddle.skia.org/c/@Path_ConvertConicToQuads
My Python version:
conictest.py.zip

The script fails with IndexError: list index out of range

Expected behavior
The returned quads list contains only 2 points, but according to the fiddle it should contain 5.

Desktop (please complete the following information):

• OS: macOS 10.15.6
• Python: 3.8
• skia-python version: 86.0

[justvanrossum]

https://github.com/justvanrossum/drawbot-skia/blob/a717c452f79b0b74e15444fafbb9472f755414f5/src/drawbot_skia/path.py#L168-L215