Cambio a string en la extension

<?php

use Illuminate\Database\Migrations\Migration;

use Illuminate\Database\Schema\Blueprint;

use Illuminate\Support\Facades\Schema;

return new class extends Migration

{

    /**

     * Run the migrations.

     */

    public function up(): void

    {

        Schema::table('telefonos', function (Blueprint $table) {

            $table->string('ext')->change();

        });

    }

    /**

     * Reverse the migrations.

     */

    public function down(): void

    {

        Schema::table('telefonos', function (Blueprint $table) {

            $table->integer('ext')->change();

        });

    }

};