nested records?
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tjsa
Named records inside the current one.
Treat much like structure, but after given total length or failure to match escapes back to the nested option's level and continue to read the record.
"Local" output settings may improve it, but it's a good idea in general.
In versio 0.3.6 field contents can be filtered by an command. Commanc can be ffe, so you can use there different structure. This implements kind of nested record solution.