fullPositionsUpdate(positions) {
    const openPositions = [];

    for (const position of positions) {
      if (position.symbol in this.positions && position.isOpen !== true) {
        delete this.positions[position.symbol];
      } else {
        openPositions.push(position);
      }
    }

    const currentPositions = {};

    for (const position of Bitmex.createPositionsWithOpenStateOnly(openPositions)) {
      currentPositions[position.symbol] = position;
    }

    this.positions = currentPositions;
  }
Updates all position; must be a full update not delta. Unknown current non orders are assumed to be closed

@param positions Position in raw json from Bitmex