message: enable clang warning float-conversion
  Summary: Enable it as an error and fix all resulting build failures in folly.
diff: @@ -298,7 +298,7 @@ void Cubic::cubicReduction(TimePoint lossTime) noexcept {
  // We need to reduce cwnd before it goes back to previous reduction point.
  // In this case, reduce the steadyState_.lastMaxCwndBytes as well:
  steadyState_.lastMaxCwndBytes =
  - cwndBytes_ * steadyState_.lastMaxReductionFactor;
  + folly::to_integral(cwndBytes_ * steadyState_.lastMaxReductionFactor);
  }
  steadyState_.lastReductionTime = lossTime;
  lossCwndBytes_ = cwndBytes_;
  