With regard to how SDL 4.0 would be written, lexed, tokenized, parsed, etc.

ANTLR seems very popular
and people have supplied a ton of grammars for it
https://github.com/antlr/grammars-v4/
maybe we can look into defining our grammar, and even soliciting some help.

KDL looked very interesting

https://kdl.dev/

One thing I noticed which seemed very scene-development / experiment-friendly
was:
"On top of that, KDL supports /- "slashdash" comments, which can be used to
comment out individual nodes, entries, or child blocks:"

Anyway, mostly wondering if we can use one of those parser-generator things, or
if we really need to keep our hand-rolled one.

-BW

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