check on get infinite loop

components.my-component.js

import Ember from 'ember';
import { computed } from '@ember/object';
import { once } from '@ember/runloop';

export default Ember.Component.extend({
  something: '',
  myPropNow: '',
  myProp: computed('something', function () { 
    let newValue = this.something.length > this.myPropNow.length ? this.something : this.myPropNow    
    once(() => { this.set('myPropNow', newValue) })
    return newValue
  }) 
});

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

{{input value=something}}
<h1>something: {{something}}</h1>
<h1>myPropNow: {{myPropNow}}</h1>
<h1>myProp: {{myProp}}</h1>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}