docs: function functs(...f) {
      /**
       * execute all included functions
       * @param {...*} [args] - arguments passed to all included functions
       * @returns {*[]}
       */
      function functs(...args) {
          return functs.run(this, args);
      }
  
      if(Array.isArray(f[0])) {
          f = f[0];
      }
      
      functs._f = f.filter((f) => {
          return typeof f === 'function';
      });
      functs.add = add.bind(functs);
      functs.remove = remove.bind(functs);
      functs.run = run.bind(functs);
      return functs;
  }