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# C Style used
- Macros are to be avoided.
- Any macro defined must be defined before its used and `undef`'d after done.
Exception part must be as following at bare minimum:
If there are more than 1 points of exception, they all must be deduplicated through `goto`'s.
The variables `err` and `reason` must be used with the following initial values.
ERL_NIF_TERM err = atom_badarg;
ERL_NIF_TERM reason = atom_err_opaque;