Fixes some warnings

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/marmot/mls/messages/Proposal.kt

@@ -247,10 +247,6 @@ sealed class Proposal : TlsSerializable {
                 ProposalType.EXTERNAL_INIT -> {
                     ExternalInit(reader.readOpaqueVarInt())
                 }
-
-                else -> {
-                    throw IllegalArgumentException("Unsupported proposal type: $type")
-                }
             }
         }
     }

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/marmot/mls/tree/LeafNode.kt

@@ -58,8 +58,8 @@ sealed class Credential : TlsSerializable {
             writer.putVectorVarInt(
                 certChain.map { cert ->
                     object : TlsSerializable {
-                        override fun encodeTls(w: TlsWriter) {
-                            w.putOpaqueVarInt(cert)
+                        override fun encodeTls(writer: TlsWriter) {
+                            writer.putOpaqueVarInt(cert)
                         }
                     }
                 },

quartz/src/commonTest/kotlin/com/vitorpamplona/quartz/marmot/MarmotSubscriptionManagerTest.kt

@@ -105,7 +105,7 @@ class MarmotSubscriptionManagerTest {
 
         assertEquals(listOf(GiftWrapEvent.KIND), filter.kinds)
         assertNotNull(filter.tags)
-        assertEquals(listOf(userPubKey), filter.tags!!["p"])
+        assertEquals(listOf(userPubKey), filter.tags["p"])
         assertNull(filter.since)
     }