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.
...
Greetings
Klaus
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