message: fix: handle non-string remapped key. closes
diff: @@ -19,6 +19,10 @@ export class Notation {
  * (e.g. <space>, <cr>, <leader>)
  */
  public static NormalizeKey(key: string, leaderKey: string): string {
  + if (typeof key !== 'string') {
  + return key;
  + }
  +
  if (!this.isSurroundedByAngleBrackets(key) && key.length > 1) {
  key = `<${key.toLocaleLowerCase()}>`;
  }
  