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Correct the units or use the unit function. Bad unit: "+this.unit.toString());var i=e.fround(t,this.value),r=String(i);if(0!==i&&1e-6>i&&i>-1e-6&&(r=i.toFixed(20).replace(/0+$/,"")),t&&t.compress){if(0===i&&this.unit.isLength())return void n.add(r);i>0&&1>i&&(r=r.substr(1))}n.add(r),this.unit.genCSS(t,n)},toCSS:e.toCSS,operate:function(t,n,i){var r=e.operate(t,n,this.value,i.value),s=this.unit.clone();if("+"===n||"-"===n)if(0===s.numerator.length&&0===s.denominator.length)s.numerator=i.unit.numerator.slice(0),s.denominator=i.unit.denominator.slice(0);else if(0===i.unit.numerator.length&&0===s.denominator.length);else{if(i=i.convertTo(this.unit.usedUnits()),t.strictUnits&&i.unit.toString()!==s.toString())throw new Error("Incompatible units. Change the units or use the unit function. 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