ObjFW  Diff

 * @return The value for the given key or `nil` if the key was not found
 */
- (nullable id)valueForKey: (OFString *)key;

/**
 * @brief Sets a value for a key.
 *
 * This is equivalent to OFMutableDictionary#setObject:forKey:. If the
 * This is equivalent to OFMutableDictionary#setObject:forKey:.
 * dictionary is immutable, an @ref OFUndefinedKeyException is thrown.
 *
 * @param key The key to set
 * @param value The value to set the key to
 * @throw OFUndefinedKeyException The dictionary is immutable
 */
- (void)setValue: (nullable id)value forKey: (OFString *)key;

/**
 * @brief Checks whether the dictionary contains an object equal to the
 *	  specified object.
 *