Implementation of deep mutable copy categories for `NSDictionary` and `NSArray`

MutableDeepCopy.md

Based on this gist

For NSDictionary:

@implementation NSDictionary (MutableDeepCopy)

//  As seen here (in the comments): https://gist.github.com/yfujiki/1664847
- (NSMutableDictionary *)mutableDeepCopy
{
    NSMutableDictionary *returnDict = [[NSMutableDictionary alloc] initWithCapacity:self.count];
    
    NSArray *keys = [self allKeys];
    
    for(id key in keys) {
        id oneValue = [self objectForKey:key];
        id oneCopy = nil;
        
        if([oneValue respondsToSelector:@selector(mutableDeepCopy)]) {
            oneCopy = [oneValue mutableDeepCopy];
        } else if([oneValue conformsToProtocol:@protocol(NSMutableCopying)]) {
            oneCopy = [oneValue mutableCopy];
        } else if([oneValue conformsToProtocol:@protocol(NSCopying)]){
            oneCopy = [oneValue copy];
        } else {
            oneCopy = oneValue;
        }
        
        [returnDict setValue:oneCopy forKey:key];
    }
    
    return returnDict;
}

@end

For NSArray:

@implementation NSArray (MutableDeepCopy)

- (NSMutableArray *)mutableDeepCopy
{
    NSMutableArray *returnArray = [[NSMutableArray alloc] initWithCapacity:self.count];
    
    for(id oneValue in self) {
        id oneCopy = nil;
        
        if([oneValue respondsToSelector:@selector(mutableDeepCopy)]) {
            oneCopy = [oneValue mutableDeepCopy];
        } else if([oneValue conformsToProtocol:@protocol(NSMutableCopying)]) {
            oneCopy = [oneValue mutableCopy];
        } else if([oneValue conformsToProtocol:@protocol(NSCopying)]){
            oneCopy = [oneValue copy];
        } else {
            oneCopy = oneValue;
        }
        
        [returnArray addObject:oneCopy];
    }
    
    return returnArray;
}

@end