constant Parameter attribute not inherited

[maximlt]

The constant Parameter attribute isn't correctly inherited in Parameterized subclasses. This was the behavior in Param 1 and somehow wasn't changed in Param 2.0. Seems like an oversight?

import param

class A(param.Parameterized):
    x = param.Parameter(1, constant=True)

class B(A):
    x = param.Parameter()

print(B.param['x'].constant)
# False

b = B()
b.x = 2

A sort of fortunate bug as that would considerably break Panel when it overrides name and doesn't set constant=False explicitly.

https://github.com/holoviz/panel/blob/d48c45f0606d407c833c02fb85c8fc03c9d9cde4/panel/widgets/base.py#L86

[jbednar]

Yes, that seems like an oversight, probably mine. Apologies!

[maximlt]

Or mine! Let's blame the test suite :)