refactor encodings

src/commonMain/kotlin/com/infendro/encoding/Hex.kt

@@ -1,14 +1,14 @@
 package com.infendro.encoding
 
 object Hex : Encoding() {
-    private val CHARACTERS = arrayOf<Byte>(
-        0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
-        0x38, 0x39, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
+    private val CHARACTERS = ubyteArrayOf(
+        0x30U, 0x31U, 0x32U, 0x33U, 0x34U, 0x35U, 0x36U, 0x37U,
+        0x38U, 0x39U, 0x61U, 0x62U, 0x63U, 0x64U, 0x65U, 0x66U,
     )
 
     override fun encode(
-        bytes: ByteArray,
-    ): ByteArray {
+        bytes: UByteArray,
+    ): UByteArray {
         return encode(
             bytes,
             CHARACTERS,
@@ -16,8 +16,8 @@ object Hex : Encoding() {
     }
 
     override fun decode(
-        bytes: ByteArray,
-    ): ByteArray {
+        bytes: UByteArray,
+    ): UByteArray {
         return decode(
             bytes,
             CHARACTERS,