dart - limit T in a generic class to types that implement some interface -

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in dart consider following

class question<t>{   string body;   t answer; }  //an interface class ianswer{   string value()=>this.tostring();   }

i need t limited types example implement interface ianswer, possible without having check if t ianswer , throw , exception in question constructor?

class question<t extends ianswer>{   string body;   t answer; }

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