docs: public long roundHalfCeiling(long instant) {
          long floor = roundFloor(instant);
          long ceiling = roundCeiling(instant);
  
          long diffFromFloor = instant - floor;
          long diffToCeiling = ceiling - instant;
  
          if (diffToCeiling <= diffFromFloor) {
              // Closer to the ceiling, or halfway - round ceiling
              return ceiling;
          } else {
              return floor;
          }
      }