NSArray property: copy or retain?

Question

According to this: NSString property: copy or retain?

For NSString/NSMutableString, copy is recommended.

How about NSArray/NSMutableArray?

Answer 1

choose copy, unless you have a very specific reason not to, as well as all the supporting code/interface to back that up.

i detailed the rationale and several implications here: NSMutableString as retain/copy

that example is based on NSStrings, but the same applies for NSArrays.