methods: {
    forceUpper: function(e, o, prop) {
				const start = e.target.selectionStart;
				e.target.value = e.target.value.toUpperCase();
				this.$set(o, prop, e.target.value);
				e.target.setSelectionRange(start, start);
			},
}


////////////////////////////////////////////////////////
 <input
      id="curp"
      name="curp"
      v-model="employee.curp"
      @input="forceUpper($event, employee, 'curp')">