merge method
Implementation
StyledTokens<T, V> merge(StyledTokens<T, V> other) {
final newMap = Map<T, V>.from(_map);
newMap.addAll(other._map);
return StyledTokens(newMap);
}
StyledTokens<T, V> merge(StyledTokens<T, V> other) {
final newMap = Map<T, V>.from(_map);
newMap.addAll(other._map);
return StyledTokens(newMap);
}