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/*
 * Return the request number of a Fam::Event object.
 *
 * Aliases:
 *   Fam::Event#request_number
 *   Fam::Event#request_num
 *   Fam::Event#request
 *   Fam::Event#req_num
 *   Fam::Event#req
 *   Fam::Event#num
 *
 * Examples:
 *   req = ev.request_number
 *
 */
static VALUE fam_ev_req(VALUE self) {