This is being emitted with [GCC 10.2.1](https://packages.debian.org/bullseye/g++-arm-linux-gnueabihf), in some CI jobs: i.e https://github.com/bitcoin/bitcoin/pull/25972/checks?check_run_id=12423693655, or https://github.com/bitcoin/bitcoin/pull/25972/checks?check_run_id=12423693651 (where we actually turn on all our warning flags with depends builds).
```bash
In file included from test/miniscript_tests.cpp:19:
./script/miniscript.h:1197:71: error: comparison of integers of different signs: 'typename iterator_traits<int *>::difference_type' (aka 'int') and 'const uint32_t' (aka 'const unsigned int') [-Werror,-Wsign-compare]
                    return std::count(subs.begin(), subs.end(), true) >= node.k;
                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~
test/miniscript_tests.cpp:346:34: note: in instantiation of function template specialization 'miniscript::Node<CPubKey>::IsSatisfiable<(lambda at test/miniscript_tests.cpp:346:48)>' requested here
        bool satisfiable = node->IsSatisfiable([](const Node&) { return true; });
                                 ^
1 error generated.
```

cc @darosior 
}
            }
            assert(false);
        };
        return TreeEval<CScript>(false, downfn, upfn);
    }
    template<typename CTx>
    std::optional<std::string> ToString(const CTx& ctx) const {
        
        
        
        auto downfn = [](bool, const Node& node, size_t) {
            return (node.fragment == Fragment::WRAP_A || node.fragment == Fragment::WRAP_S ||
                    node.fragment == Fragment::WRAP_D || node.fragment == Fragment::WRAP_V ||
                    node.fragment == Fragment::WRAP_J || node.fragment == Fragment::WRAP_N ||
                    node.fragment == Fragment::WRAP_C ||
                    (node.fragment == Fragment::AND_V && node.subs[1]->fragment == Fragment::JUST_1) ||
                    (node.fragment == Fragment::OR_I && node.subs[0]->fragment == Fragment::JUST_0) ||
                    (node.fragment == Fragment::OR_I && node.subs[1]->fragment == Fragment::JUST_0));
        };
        
        
        auto upfn = [&ctx](bool wrapped, const Node& node, Span<std::string> subs) -> std::optional<std::string> {
            std::string ret = wrapped ? ":" : "";
            switch (node.fragment) {
                case Fragment::WRAP_A: return "a" + std::move(subs[0]);
                case Fragment::WRAP_S: return "s" + std::move(subs[0]);
                case Fragment::WRAP_C:
                    if (node.subs[0]->fragment == Fragment::PK_K) {