Prefer applicable methods from most derived type

Bonsai.Core/Expressions/ExpressionBuilder.cs

@@ -765,6 +765,7 @@ class CallCandidate
  internal static readonly CallCandidate Ambiguous = new CallCandidate();
  internal static readonly CallCandidate None = new CallCandidate();
  internal MethodBase method;
+ internal Type declaringType;
  internal Expression[] arguments;
  internal bool generic;
  internal bool expansion;
@@ -818,6 +819,7 @@ static CallCandidate OverloadResolution(IEnumerable<MethodBase> methods, params
  return new CallCandidate
  {
  method = method,
+ declaringType = method.DeclaringType,
  arguments = callArguments,
  generic = method.IsGenericMethod,
  expansion = ParamExpansionRequired(parameters, argumentTypes),
@@ -853,6 +855,15 @@ static CallCandidate OverloadResolution(IEnumerable<MethodBase> methods, params
  // skip self-test
  if (i == j) continue;
 
+ // exclude self if declaring type is base type of other; and vice-versa
+ if (candidates[i].declaringType != candidates[j].declaringType)
+ {
+ if (candidates[i].declaringType.IsAssignableFrom(candidates[j].declaringType))
+ candidates[i].excluded = true;
+ else candidates[j].excluded = true;
+ continue;
+ }
+
  // compare implicit type conversion
  var comparison = CompareFunctionMember(
  candidateParameters[i],