docs: function Ops (ref, key) {
  		this.ref = ref;
  		this.key = key;
  
  		if (this.ref[this.key] === undefined) {
  			this.ref[this.key] = 0;
  		}
  		this._toNumber();
  
  		this.isNumber = (typeof this.ref[this.key] === 'number');
  		this.isBoolean = (typeof this.ref[this.key] === 'boolean');
  		this.isString = (typeof this.ref[this.key] === 'string');
  		this.isArray = Array.isArray(this.ref[this.key]);
  		this.isObject = (!this.isArray && typeof this.ref[this.key] === 'object');
  	}