message: utils(src/internal): initProperty: update whatis-error
diff: @@ -138,7 +138,7 @@ export function initProperty(name: string, key: string, whatis: WhatIsIt) {
  break;
  default:
  /* istanbul ignore next */ // ignore because this case should really never happen (typescript prevents this)
  - throw new TypeError('"whatis" is not supplied OR doesn\'t have a case yet! [E013]');
  + throw new TypeError(`"${whatis}"(whatis(subSchema)) is invalid for "${name}.${key}" [E013]`);
  }
  return schemaProp;
  