ambiguous QSharedPointer overloads with polymorphic base class

#include <QSharedPointer>
#include <memory>

struct Base1 {};
struct Base2 {};

struct Child1 : Base1 {};
struct Child2 : Base2 {};

template<template<typename> typename SmartPtr>
struct Overloaded
{
    static void overloaded(const SmartPtr<const Base1> &) {}
    static void overloaded(const SmartPtr<const Base2> &) {}
};

template<template<typename> typename SmartPtr>
void test()
{
    Overloaded<SmartPtr>::overloaded(SmartPtr<Base1>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<Base2>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<const Base1>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<const Base2>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<Child1>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<Child2>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<const Child1>{});
    Overloaded<SmartPtr>::overloaded(SmartPtr<const Child2>{});
}

int main()
{
    test<std::shared_ptr>();
    test<QSharedPointer>();
    return 0;
}

test.cpp: In instantiation of ‘void test() [with SmartPtr = QSharedPointer]’:
test.cpp:33:26:   required from here

test.cpp:20:37: error: call of overloaded ‘overloaded(QSharedPointer<Base1>)’ is ambiguous
     Overloaded<SmartPtr>::overloaded(SmartPtr<Base1>{});
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

test.cpp:13:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base1>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base1> &) {}
                 ^~~~~~~~~~

test.cpp:14:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base2>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base2> &) {}
                 ^~~~~~~~~~

test.cpp:21:37: error: call of overloaded ‘overloaded(QSharedPointer<Base2>)’ is ambiguous

     Overloaded<SmartPtr>::overloaded(SmartPtr<Base2>{});
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

test.cpp:13:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base1>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base1> &) {}
                 ^~~~~~~~~~

test.cpp:14:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base2>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base2> &) {}
                 ^~~~~~~~~~

test.cpp:24:37: error: call of overloaded ‘overloaded(QSharedPointer<Child1>)’ is ambiguous
     Overloaded<SmartPtr>::overloaded(SmartPtr<Child1>{});
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

test.cpp:13:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base1>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base1> &) {}
                 ^~~~~~~~~~

test.cpp:14:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base2>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base2> &) {}
                 ^~~~~~~~~~

test.cpp:25:37: error: call of overloaded ‘overloaded(QSharedPointer<Child2>)’ is ambiguous
     Overloaded<SmartPtr>::overloaded(SmartPtr<Child2>{});
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

test.cpp:13:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base1>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base1> &) {}
                 ^~~~~~~~~~

test.cpp:14:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base2>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base2> &) {}
                 ^~~~~~~~~~

test.cpp:26:37: error: call of overloaded ‘overloaded(QSharedPointer<const Child1>)’ is ambiguous
     Overloaded<SmartPtr>::overloaded(SmartPtr<const Child1>{});
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

test.cpp:13:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base1>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base1> &) {}
                 ^~~~~~~~~~

test.cpp:14:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base2>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base2> &) {}
                 ^~~~~~~~~~

test.cpp:27:37: error: call of overloaded ‘overloaded(QSharedPointer<const Child2>)’ is ambiguous
     Overloaded<SmartPtr>::overloaded(SmartPtr<const Child2>{});
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

test.cpp:13:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base1>&) [with SmartPtr = QSharedPointer]’
     static void overloaded(const SmartPtr<const Base1> &) {}
                 ^~~~~~~~~~

test.cpp:14:17: note: candidate: ‘static void Overloaded<SmartPtr>::overloaded(const SmartPtr<const Base2>&) [with SmartPtr = QSharedPointer]’

     static void overloaded(const SmartPtr<const Base2> &) {}