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blog(nix-iceberg): explain set.a or "mewo" is set-specific

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@ -581,7 +581,13 @@ It was created by [t184256](https://github.com/t184256) on GitHub, here is the
## `set.a or "meow"` is set-specific
TODO
[As mentioned previously,](#let-a-1-or-6-in-a-or-9-) the Nix parser is weird and
treats `or` as an identifier when it is not right after an attribute selection
expression.
So, the `or` in `set.key or default` is the keyword, but in `set or default` it
is not, and the latter expression is actually a double function application,
where we apply `or` to `set`, and then `default` to the result of that.
## `builtins.toString [true false true] == "1 1"`