use asByteArray _view_ where possible (optimization)

src/commonTest/kotlin/KeysTest.kt

@@ -250,4 +250,16 @@ class KeysTest {
         val k1: UniversalKey = biunpack<UniversalKey>(d) as SymmetricKey
         assertEquals(k, k1)
     }
+
+    @Test
+    fun verifyingKeySerializationTest() = runTest {
+        initCrypto()
+        val k = SigningSecretKey.new()
+        val s1 = pack(k)
+        val s2 = pack(k.verifyingKey)
+        val dk1 = unpack<SigningSecretKey>(s1)
+        val dk2 = unpack<VerifyingPublicKey>(s2)
+        assertEquals(k, dk1)
+        assertEquals(k.verifyingKey, dk2)
+    }
 }