OnValidate With Only User Changes?

What can i use to ignore the initial OnValidate() call when i first press play in Unity Editor?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class ValidationTest : MonoBehaviour {
6.     public float somefloat;
7.     void Awake()
8.     {
9.         Debug.Log ("Awake...");
10.     }
11.     void Start () {
12.         Debug.Log ("Start...");
13.     }
14.     void OnValidate()
15.     {
16.         Debug.Log ("Validating...");
17.         if (Application.isPlaying == false && Application.isEditor == true) {
18.             Debug.Log ("Because of the execution order, this check is ineffective for differentiating between an in editor change, and the assembly reload when the play button is pressed. What can i use instead?");
19.         }
20.     }
21. }

I'm guessing this is being called because of the assembly reload on play?

not a game breaker, but i would be interested in how to ignore this if it is possible?

Thanks