message: build: fixing a downstream compile error by noting explicit fallthrough
diff: @@ -205,6 +205,7 @@ void HeaderString::setInteger(uint64_t value) {
  case Type::Inline:
  // buffer_.dynamic_ should always point at inline_buffer_ for Type::Inline.
  ASSERT(buffer_.dynamic_ == inline_buffer_);
  + FALLTHRU;
  case Type::Dynamic: {
  // Whether dynamic or inline the buffer is guaranteed to be large enough.
  ASSERT(type_ == Type::Inline || dynamic_capacity_ >= MaxIntegerLength);
  