function( keyContents ) {
			this.keyContents = keyContents;
			this.keyId = Backbone.Relational.store.resolveIdForItem( this.relatedModel, this.keyContents );
		}
function( keyContents ) {
			this.keyContents = keyContents;
			this.keyId = Backbone.Relational.store.resolveIdForItem( this.relatedModel, this.keyContents );
		}
function ( keyContents ) { this . keyContents = keyContents ; this . keyId = Backbone . Relational . store . resolveIdForItem ( this . relatedModel , this . keyContents ) ; }
Normalize and reduce `keyContents` to an `id`, for easier comparison
@param {String|Number|Backbone.Model} keyContents
Normalize and reduce keyContents to an id for easier comparison