Make conversion_cost to ScalarNonlinearFunction work only for Float64

Author: odow

src/Bridges/Constraint/bridges/AbstractFunctionConversionBridge.jl

@@ -269,8 +269,8 @@ function conversion_cost(
     ::Type{
         <:Union{
             MOI.VariableIndex,
-            MOI.ScalarAffineFunction,
-            MOI.ScalarQuadraticFunction,
+            MOI.ScalarAffineFunction{Float64},
+            MOI.ScalarQuadraticFunction{Float64},
         },
     },
 )

test/Bridges/Objective/SlackBridge.jl

@@ -525,10 +525,6 @@ function test_complex_objective()
             MOI.Utilities.Model{Float64}(),
             Float64,
         )
-        MOI.Bridges.remove_bridge(
-            dest,
-            MOI.Bridges.Objective.ToScalarNonlinearBridge{Float64},
-        ) # Otherwise, would be bridged to Nonlinear. 
         @test_throws MOI.UnsupportedAttribute(attr) MOI.copy_to(dest, model)
     end
     return

test/Bridges/debug.jl

@@ -188,10 +188,6 @@ end
 
 function test_print_active_bridges_objective_unsupported()
     model = MOI.Bridges.full_bridge_optimizer(Model{Float64}(), Float64)
-    MOI.Bridges.remove_bridge(
-        model,
-        MOI.Bridges.Objective.ToScalarNonlinearBridge{Float64},
-    ) # Otherwise, Int would be bridged to Nonlinear.
     F = MOI.ScalarAffineFunction{Int}
     @test_throws(
         MOI.UnsupportedAttribute{MOI.ObjectiveFunction{F}},