[!795] Make Dune::Hybrid::accumulate to be usable in constexpr context
Merge branch 'feature/hybrid-more-constexpr' into 'master'
ref:core/dune-common\> Make Dune::Hybrid::accumulate to be usable in constexpr
context.
See merge request [!795]
[!795]: gitlab.dune-project.org/core/dune-common/merge_requests/795