Updated OperatorEnum to use any data type (not just Numbers)

ext/DynamicExpressionsOptimExt.jl

@@ -6,7 +6,8 @@ using DynamicExpressions:
     filter_map,
     eval_tree_array,
     get_constants,
-    set_constants!
+    set_constants!,
+    get_number_type
 using Compat: @inline
 
 import Optim: Optim, OptimizationResults, NLSolversBase
@@ -47,6 +48,11 @@ function wrap_func(
         set_constants!(tree, x, refs)
         return @inline(f(first_args..., tree))
     end
+    # without first args, it looks like this
+    # function wrapped_f(x)
+    #     set_constants!(tree, x, refs)
+    #     return @inline(f(tree))
+    # end
     return wrapped_f
 end
 function wrap_func(
@@ -100,6 +106,7 @@ function Optim.optimize(
     if make_copy
         tree = copy(tree)
     end
+
     x0, refs = get_constants(tree)
     if !isnothing(h!)
         throw(

src/DynamicExpressions.jl

@@ -4,6 +4,7 @@ using DispatchDoctor: @stable, @unstable
 
 @stable default_mode = "disable" begin
     include("Utils.jl")
+    include("TypeInterface.jl")
     include("ExtensionInterface.jl")
     include("OperatorEnum.jl")
     include("Node.jl")
@@ -73,6 +74,13 @@ import .ExpressionModule:
 @reexport import .ParseModule: @parse_expression, parse_expression
 import .ParseModule: parse_leaf
 @reexport import .ParametricExpressionModule: ParametricExpression, ParametricNode
+@reexport import .TypeInterfaceModule:
+    is_valid,
+    is_valid_array,
+    get_number_type,
+    append_number_constants!,
+    pop_number_constants,
+    count_number_constants
 
 @stable default_mode = "disable" begin
     include("Interfaces.jl")