Changed Symbol from using Int to BigInteger

Author: Dr. Brandon Wiley

Codex/src/main/java/org/operatorfoundation/codex/symbols/Binary.kt

@@ -1,21 +1,23 @@
 package org.operatorfoundation.codex.symbols
 
+import java.math.BigInteger
+
 class Binary : Symbol {
     override fun size(): Int = 2
 
     override fun toString(): String {
         return "Binary"
     }
 
-    override fun decode(encodedValue: ByteArray): Int {
+    override fun decode(encodedValue: ByteArray): BigInteger {
         return when (encodedValue.decodeToString()) {
             "0" -> 0
             "1" -> 1
             else -> throw IllegalArgumentException("Binary, bad value $encodedValue")
         }
     }
 
-    override fun encode(numericValue: Int): ByteArray {
+    override fun encode(numericValue: BigInteger): ByteArray {
         return when (numericValue) {
             0 -> "0".toByteArray()
             1 -> "1".toByteArray()

Codex/src/main/java/org/operatorfoundation/codex/symbols/Symbol.kt

@@ -1,5 +1,7 @@
 package org.operatorfoundation.codex.symbols
 
+import java.math.BigInteger
+
 /**
  * Base interface for all symbol types that can encode/decode values.
  * Symbols represent different character sets or value ranges (e.g., letters, numbers, bytes).
@@ -21,7 +23,7 @@ interface Symbol
      * @param encodedValue Can be Char, String, or Int depending on the symbol
      * @return The decoded integer value
      */
-    fun decode(encodedValue: ByteArray): Int
+    fun decode(encodedValue: ByteArray): BigInteger
 
     /**
      * Encodes a numeric value to its symbol representation.
@@ -30,5 +32,5 @@ interface Symbol
      * @param numericValue The integer to encode
      * @return Can be Char, String, or Int depending on the symbol
      */
-    fun encode(numericValue: Int): ByteArray
+    fun encode(numericValue: BigInteger): ByteArray
 }