fix ShadowDOM on browsers with non-native template

pkg/shadow_dom/lib/shadow_dom.min.js

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Array.isArray(a)&&(c.length=a.length),c}function p(a,b,c,d){if(this.closed=!1,this.object=a,this.callback=b,this.target=c,this.token=d,this.reporting=!0,F){var e=this;this.boundInternalCallback=function(a){e.internalCallback(a)}}q(this)}function q(a){V&&(U.push(a),p._allObserversCount++)}function r(a,b,c,d){p.call(this,a,b,c,d),this.connect(),this.sync(!0)}function s(a,b,c,d){if(!Array.isArray(a))throw Error("Provided object is not an Array");r.call(this,a,b,c,d)}function t(a){this.arr=[],this.callback=a,this.isObserved=!0}function u(a,b,c,d,e,g,h){var b=b instanceof i?b:j(b);return b&&b.length&&f(a)?(p.call(this,a,c,d,e),this.valueFn=g,this.setValueFn=h,this.path=b,this.connect(),this.sync(!0),void 0):(this.value_=b?b.getValueFrom(a):void 0,this.value=g?g(this.value_):this.value_,this.closed=!0,void 0)}function v(a,b,c,d){p.call(this,void 0,a,b,c),this.valueFn=d,this.observed=[],this.values=[],this.value=void 0,this.oldValue=void 0,this.oldValues=void 0,this.changeFlags=void 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