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@method isOwner
@description isOwner description
@param {xxx} user -- xxx
@param {xxx} object -- xxx
@returns {xxx} -- xxx
function(user, object) {
    // XXX stringify for $oid mainly. may want to optimize for perf later
    return EJSON.stringify(object[this.ownerField]) === EJSON.stringify(user._id)
//    return object[this.ownerField] === user._id
  }