does not work on derived classes?

[devleaks]

Hello,
I'm no python specialist, just a regular user.
I derived a class from Feature but then, turfpy operations on those derived classes no longer work...

from geojson import Point, Feature
from turfpy.measurement import distance

class Vertex(Feature):
    def __init__(self, node: str, point: Point):
        Feature.__init__(self, geometry=point)
        self.nodeid = node

p1 = Point((25.25458, 51.623879))
f1 = Feature(geometry=p1)
v1 = Vertex("v1", point=p1)
p2 = Point((25.254626, 51.624053))
f2 = Feature(geometry=p2)
v2 = Vertex("v2", point=p2)

df = distance(f1, f2)
print("df: ",df)  # df:  0.019606799666682842

print("v1 is feature?", isinstance(v1, Feature))  # true

dv = distance(v1, v2)
print("dv: ", dv)
# Error:
# Traceback (most recent call last):
#   File "ft.py", line 19, in <module>
#     dv = distance(v1, v2)
#   File "/usr/local/miniconda3/lib/python3.9/site-packages/turfpy/measurement.py", line 112, in distance
#     coordinates1 = get_coord(point1)
#   File "/usr/local/miniconda3/lib/python3.9/site-packages/turfpy/helper.py", line 80, in get_coord
#     raise Exception("coord must be GeoJSON Point or an Array of numbers")
# Exception: coord must be GeoJSON Point or an Array of numbers

I'd rather derive my Vertex class from Feature rather than "compose" by adding a feature attribute to my Vertex class.
Thanks in advance for your help.
P.

[sackh]

@devleaks Thanks for reporting this. We will have to fix this. as type checking is not done correctly.