withNaming - default modifier's delimiter is undefined

[ViieeS]

Example

If I call it like this:

const cn = withNaming({e: '__'});

cn('bl')('el', { mod: 'val' });
// -> bl__elundefinedmodundefinedval

It only works if I explicitly specify the modifier

withNaming({e: '__', m: '_'});

[tadatuta]

can be fixed with https://github.com/bem/bem-react/compare/issues/561?expand=1

but I don't think it should be fixed actually. as there's no such thing like default mod delimiter (there's default naming preset though) and providing such fallback will increase package size with almost no reason.