bugprone-fold-init-type

The check flags type mismatches in folds like std::accumulate that might result in loss of precision. std::accumulate folds an input range into an initial value using the type of the latter, with operator+ by default. This can cause loss of precision through:

auto a = {0.5f, 0.5f, 0.5f, 0.5f};
return std::accumulate(std::begin(a), std::end(a), 0);
auto a = {65536LL * 65536 * 65536};
return std::accumulate(std::begin(a), std::end(a), 0);