function/stdlib: ChunklistFunc precise mark handling #100
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Will now preserve markings on individual input elements, without aggregating them on the returned top-level list.
Marks on the list or on the chunk size will still propagate to the top-level return value.
Chunklist
previously didn't have any tests, so I've added some here in addition to the coverage for the mark handling. I also did some light reorganization so that the argument error handling happens before any of the short-circuit return paths.