On Aug 12, 2008, at 12:50 , Klaus Backert wrote:
About $Null:It it were a reserved word, it would be documented so.The "Archives and Serializations Programming Guide for Cocoa" says: Keyed Archives ... Naming Values ...You should avoid using “$” as a prefix for your keys. The keyed archiver and unarchiver use keys prefixed with “$” for internal values. Although they test for and mangle user-defined keys that have a “$” prefix, this overhead slows down archiving performance....
In this case, however, it's the actual value being encoded... not the key name. Also, if you read it, it suggests that you shouldn't use it for performance reasons. It specifically states that it is supposed to properly mangle the $ in a key name (causing the performance loss)...
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