The >= operator fails

[codykarcher]

# =================
# Import Statements
# =================
import numpy as np
import pyomo.environ as pyo
from pyomo.contrib.edi import Formulation
from pyomo.contrib.edi import BlackBoxFunctionModel
from pyomo.contrib.edi.solvers.solver import cvxopt_solve
f = Formulation()

cst = f.Constant(name = 'c',  value = 3.0, units = '-', size = 0, description = 'A constant')
c2  = f.Constant(name = 'c2', value = 2,   units = '-', size = 0, description = 'A constant')
x   = f.Variable(name = 'x',  guess = 1.0, units = '-', size = 0, description = 'The X variable')
y   = f.Variable(name = 'y',  guess = 2.0, units = '-', size = 0, description = 'The Y variable')


f.Objective( x**2 + 4*y**c2 +1 + x*y )
f.ConstraintList(
    [
        x >= 1,
        y >= 1,
        x + 1/(1+y*x) >= cst,
    ]
)

res = cvxopt_solve(f)
print(res)
print(res['x'])