in my template,i have :
<li data-_id="{{category._id}" on-click="{{selectCategory}}">...

in js :
Polymer('my-categories', {
  ready: function() {
    this.categories = [
      {_id: 1, name: 'Abonnements'}
      , {_id: 2, name: 'Clés de logiciels'}
      , {_id: 3, name: 'Formulaires'}
      , {_id: 4, name: 'Groupes de nouvelles'}
      , {_id: 5, name: 'Références'}
    ];
  },     
  selectCategory: function(e) {
    this.selectedCategoryId = e.target.dataset._id;
    console.log("this.selectedCategoryId = " + this.selectedCategoryId);
    // => this.selectedCategoryId = {{category._id}
  }
});


when i click to one element i get :
this.selectedCategoryId = {{category._id}
insted of a number in 1..5, why?

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