Question is incorrectly formulated. Any "can I xxx in Emacs?" should be written "how do I do xxx in Emacs?" -- Commenter on Stack Overflow
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Linux historically used magic numbers to recognise structs being used incorrectly with void pointers. These have been increasingly replaced with type-safe macros: https://lwn.net/SubscriberLink/915163/ba83480903b82cb8/
Some of the original files were unchanged from the 90s!
'S-expressions are a bad idea' by notable lisper Dave Moon:
https://cl.cddddr.org/index.cgi?Essay:S-expressions are a bad idea&l=
Argues in favour of richer data types for syntax rather than lists and symbols. It's true: propagating positions when your macro is incorrectly used is difficult!
It's unfortunate how sites will require you to type in your password incorrectly before you can request a password reminder. It's awkward.