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 
}
        case DecodeContext::OR_B: {
            if (constructed.size() < 2) return {};
            BuildBack(Fragment::OR_B, constructed, true);
            break;
        }
        case DecodeContext::OR_C: {
            if (constructed.size() < 2) return {};
            BuildBack(Fragment::OR_C, constructed, true);
            break;
        }
        case DecodeContext::OR_D: {
            if (constructed.size() < 2) return {};
            BuildBack(Fragment::OR_D, constructed, true);
            break;
        }
        case DecodeContext::ANDOR: {
            if (constructed.size() < 3) return {};
            NodeRef<Key> left = std::move(constructed.back());
            constructed.pop_back();
            NodeRef<Key> right = std::move(constructed.back());
            constructed.pop_back();
            NodeRef<Key> mid = std::move(constructed.back());
            constructed.back() = MakeNodeRef<Key>(internal::NoDupCheck{}, Fragment::ANDOR, Vector(std::move(left), std::move(mid), std::move(right)));
            break;
        }
        case DecodeContext::THRESH_W: {
            if (in >= last) return {};
            if (in[0].first == OP_ADD) {
                ++in;