Should spaces compare as equal with their dual?

[jrmaddison]

e.g.

from firedrake import *

mesh = UnitIntervalMesh(10)
V = FunctionSpace(mesh, "Lagrange", 1)
V_star = V.dual()

assert bool(V == V_star)  # Passes

so a space and its dual compare as equal. This isn't what I'd expected -- is this a bug?

[dham]

Looks like a bug to me.

[jrmaddison]

#3130