Gradually editing the scale of an object

Hello. Excuse me for any grammatical errors.

I'm trying to gradually resize an object and I know how to do this but i'm having some troubles on the scale check, let me explain it better..

I'm using this code to resize the object :

     IEnumerator makeObjSmaller()
     {
         while (transform.localScale != new Vector3 (0.15F, 0.15F, 0.15F)) {
             transform.localScale -= new Vector3 (0.01F, 0.01F, 0.01F);
                 yield return new WaitForSeconds (0.001f);
         }
     }

The problem here is that the scale will never be equals to (0.15F, 0.15F, 0.15F), I don't know why but after about 10 cicles the scale becomes equal to something like "x.xyzabc" (letters simply are variables).

Assuming that the initial value of the object's scale is (40, 40, 40), during the while cicle it should become something like ( 39.99, 39.98 ... 0.06, 0.05) so only two digits after the comma not 6, it will become something like (0.059584) that's not equal to (0.05).