How safe is @1 as dictionary key. NSInteger, NSUInteger int32_t will always map to the same key?

dictionary keys

typedef NS_ENUM(int32_t, CFG) {
	CFG10,
	CFG20,
	CFG30
};

NSDictionary *const cfgToString = @{
	@(CFG10) : @"CFG10",
	@(CFG20) : @"CFG20",
	@(CFG30) : @"CFG30"
};

NSDictionary *const cfgFromString = @{
	@"CFG10" : @(CFG10),
	@"CFG20" : @(CFG20),
	@"CFG30" : @(CFG30)
};