Umbrella issue for 26.0 testing. Please help testing on a wide variety of supported platforms, as well as interaction with different software.

Let us know which version you tested on which operating system.

If you find an issue, please search Github for known issues first and then open a new Github issue.

*This meta issue should not be used to report bugs, as a single thread makes it impossible to track more than one topic.*

See [26.0 Draft Release Notes](https://github.com/bitcoin-core/bitcoin-devwiki/wiki/26.0-Release-Notes-Draft) for a list of changes.

See here for the testing guide: https://github.com/bitcoin-core/bitcoin-devwiki/wiki/26.0-Release-Candidate-Testing-Guide.
{
    auto resource = PoolResource<128, 8>(1024);
    uint8_t num_allocs = 200;
    auto data = std::vector<Span<uint8_t>>();
    
    for (uint8_t num_bytes = 0; num_bytes < num_allocs; ++num_bytes) {
        uint8_t* bytes = new (resource.Allocate(num_bytes, 1)) uint8_t[num_bytes];
        BOOST_TEST(bytes != nullptr);
        data.emplace_back(bytes, num_bytes);
        
        std::fill(bytes, bytes + num_bytes, num_bytes);
    }
    
    uint8_t val = 0;
    for (auto const& span : data) {
        for (auto x : span) {
            BOOST_TEST(val == x);
        }
        std::destroy(span.data(), span.data() + span.size());
        resource.Deallocate(span.data(), span.size(), 1);
        ++val;
    }
    PoolResourceTester::CheckAllDataAccountedFor(resource);
}
BOOST_AUTO_TEST_CASE(random_allocations)