docs: function processAddSubtract(tokenizer, scope) {
    let node = processMultiplyDivide(tokenizer, scope);
  
    while (tokenizer.token.match(types.ADD_SUBTRACT)) {
      node = createOperatorNode(tokenizer.token.value, [node, processMultiplyDivide(tokenizer.skipToken(), scope)]);
    }
  
    return node;
  }