Move number string parsing from the parser into the reducer.

core/src/main/java/org/nwapw/abacus/parsing/ShuntingYardParser.java

@@ -143,7 +143,7 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
                 else return new UnaryNode(operator, applyTo);
             }
         } else if (matchType == TokenType.NUM) {
-            return new NumberNode(abacus.numberFromString(match.getContent()));
+            return new NumberNode(match.getContent());
         } else if (matchType == TokenType.VARIABLE) {
             return new VariableNode(match.getContent());
         } else if (matchType == TokenType.FUNCTION) {

core/src/main/java/org/nwapw/abacus/tree/NumberReducer.java

@@ -27,7 +27,7 @@ public class NumberReducer implements Reducer<NumberInterface> {
     @Override
     public NumberInterface reduceNode(TreeNode node, Object... children) {
         if (node instanceof NumberNode) {
-            return ((NumberNode) node).getNumber();
+            return abacus.numberFromString(((NumberNode) node).getNumber());
         } else if(node instanceof VariableNode) {
             return abacus.numberFromString("0");
         } else if (node instanceof BinaryNode) {

core/src/main/kotlin/org/nwapw/abacus/tree/NumberNode.kt

@@ -10,14 +10,14 @@ import org.nwapw.abacus.number.NumberInterface
  *
  * @number the number value of this node.
  */
-data class NumberNode(val number: NumberInterface) : TreeNode() {
+data class NumberNode(val number: String) : TreeNode() {
 
     override fun <T : Any> reduce(reducer: Reducer<T>): T? {
         return reducer.reduceNode(this)
     }
 
     override fun toString(): String {
-        return number.toString()
+        return number
     }
 
 }