I have a large class I'm archiving that I would like to lazy-load. It's basically a wrapper around a NSArray and what I'd like to do is load some instance variables but leave the array archived until a later time in order to save time and memory.

When I implement the NSCoding protocol methods initWithCoder: and encodeWithCoder: is it a bad idea to de-archive the keys that I need and just retain the NSCoder object so that I can later de-archive the NSArray? Is there any problem keeping the NSCoder object around for long periods of time? Is there a better way of doing this?

I'd hate to have to archive two separate objects in order to implement this, one which is the actual class with a placeholder array and then the large array separately, but I guess that's another way to go.
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