Add notice about deepStrictEqual method

Author: vejol

src/content/4/en/part4a.md

@@ -736,7 +736,7 @@ The value returned by the function could be in the following format:
 }
 ```
 
-**NB** when you are comparing objects, the [deepStrictEqual](https://nodejs.org/api/assert.html#assertdeepstrictequalactual-expected-message) method is probably what you want to use, since the [strictEqual](https://nodejs.org/api/assert.html#assertstrictequalactual-expected-message) tries to verify that the two values are the same value, and not just that they contain the same properties. For differences between various assert module functions, you can refer to [this Stack Overflow answer](https://stackoverflow.com/a/73937068/15291501).
+**NB** when you are comparing objects, the [deepStrictEqual](https://nodejs.org/api/assert.html#assertdeepstrictequalactual-expected-message) method is probably what you want to use, as it ensures that the objects have the same attributes. For differences between various assert module functions, you can refer to [this Stack Overflow answer](https://stackoverflow.com/a/73937068/15291501).
 
 Write the tests for this exercise inside of a new <i>describe</i> block. Do the same for the remaining exercises as well.
 

src/content/4/fi/osa4a.md

@@ -724,6 +724,8 @@ Paluuarvo voi olla esim. seuraavassa muodossa:
 }
 ```
 
+**HUOM.** Kun vertailet olioita, haluat luultavimmin käyttää [deepStrictEqual](https://nodejs.org/api/assert.html#assertdeepstrictequalactual-expected-message)-metodia, sillä se tarkistaa, että olioilla on samat attribuutit. Assert-moduulin eri metodeista voit lukea lisää esimerkiksi [tästä Stack Overflow -vastauksesta](https://stackoverflow.com/a/73937068/15291501).
+
 Tee myös tämän ja seuraavien kohtien testit kukin oman <i>describe</i>-lohkonsa sisälle.
 
 #### 4.6*: apufunktioita ja yksikkötestejä, step4