parametricCurve produces wrong result with high stop value

changing stop value from 3.8 to 4 produces corrupted spiral
```python
from math import cos, pi, sin
import cadquery as cq

def helix():
def func(t):
x = cos(t*pi*2)
y = sin(t*pi*2)
z = t
return (x, y, z)
return func

p1 = (cq.Workplane("XY")
.parametricCurve(helix(),stop=4).val()
)
show_object(p1)
```

# Environment

OS: Windows 11

Was CadQuery installed using Conda?: No, installed with pip. Python 3.14.3
```
cadquery 2.8.0
cadquery-ocp 7.9.3.1.1
```

Start with the provided Python reproduction and the parametricCurve entry point, comparing stop=3.8 with stop=4 on the stated CadQuery and cadquery-ocp versions. Confirm the generated curve remains a valid, correctly shaped spiral at the higher stop value and use that comparison to define regression coverage.

Written by the indexing model from the issue text.