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 Fragment::SHA256: {
                    std::vector<unsigned char> preimage;
                    Availability avail = ctx.SatSHA256(node.data, preimage);
                    return {ZERO32, InputStack(std::move(preimage)).SetAvailable(avail)};
                }
                case Fragment::RIPEMD160: {
                    std::vector<unsigned char> preimage;
                    Availability avail = ctx.SatRIPEMD160(node.data, preimage);
                    return {ZERO32, InputStack(std::move(preimage)).SetAvailable(avail)};
                }
                case Fragment::HASH256: {
                    std::vector<unsigned char> preimage;
                    Availability avail = ctx.SatHASH256(node.data, preimage);
                    return {ZERO32, InputStack(std::move(preimage)).SetAvailable(avail)};
                }
                case Fragment::HASH160: {
                    std::vector<unsigned char> preimage;
                    Availability avail = ctx.SatHASH160(node.data, preimage);
                    return {ZERO32, InputStack(std::move(preimage)).SetAvailable(avail)};
                }
                case Fragment::AND_V: {
                    auto& x = subres[0], &y = subres[1];
                    
                    
                    
                    
                    
                    
                    return {(y.nsat + x.sat).SetNonCanon(), y.sat + x.sat};
                }