`NumberOfConstraints` is 0!

[parkyr]

ToQUBO.QUBOModel{Float64}
├ ObjectiveSense: MIN_SENSE
├ ObjectiveFunctionType: MOI.ScalarQuadraticFunction{Float64}
├ NumberOfVariables: 9941
└ NumberOfConstraints: 0
└ MOI.VariableIndex in MOI.ZeroOne: 0