MapSignalImpl<K, V> class

Implementation of MapSignal that automatically notifies subscribers when modified.

This is the concrete implementation of the MapSignal interface. MapSignal extends Signal to provide full Map functionality while maintaining reactivity. All map operations (put, remove, clear, etc.) will trigger notifications to subscribers.

See MapSignal for the public interface and usage examples.

Example:

final userMap = MapSignal<String, dynamic>({'name': 'Alice', 'age': 30});

Effect(() => print('User: ${userMap['name']}, Age: ${userMap['age']}'));
// Prints: "User: Alice, Age: 30"

userMap['name'] = 'Bob';
// Prints: "User: Bob, Age: 30"

userMap['city'] = 'New York';
// Prints: "User: Bob, Age: 30" (if city is not used in effect)

userMap.addAll({'age': 25, 'country': 'USA'});
// Prints: "User: Bob, Age: 25"

userMap.clear();
// Prints: "User: null, Age: null"