Hi,

Now that Alex has the answer to his problem, can I ask a follow-up question 
based on this line in his initial email?

> On 9 May 2021, at 1:12 am, Alex Zavatone via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
>        _configurationDictionary = [[NSMutableDictionary 
> alloc]initWithDictionary:[NSDictionary 
> dictionaryWithContentsOfFile:filePath]];

What's the benefit of having the immutable NSDictionary in the mix there?
        _configurationDictionary = [[NSMutableDictionary alloc] 
initWithDictionary:[NSDictionary dictionaryWithContentsOfFile:filePath]]

Is that somehow better than:
        _configurationDictionary = [[NSMutableDictionary alloc] 
initWithContentsOfFile:filePath]

or even:
        _configurationDictionary = [NSMutableDictionary 
dictionaryWithContentsOfFile:filePath]

Is any one more efficient than the other (I would've assumed the last one, with 
there being fewer objects and messages) but I suppose it's possible the 
compiler ends up optimising them all to be the same anyway?

Mark

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