I think for "untyped" files with records, using the ASCII file, (group) and record separators (hex 1C, 1D and 1E) work nicely. The only constraint is that the content cannot contain these characters, but I found that that is generally no problem in practice. Also the file is less human readable with a simple text editor.
For other use cases I would use newline separated JSON. Is has most of the benefits as written in the article, except the uncompressed file size.
For other use cases I would use newline separated JSON. Is has most of the benefits as written in the article, except the uncompressed file size.