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$ csv-check -v1 test.ssv --allow-loose-quotes -L
  allow_loose_escapes   : 0
...
  types                 : (undef)
  undef_str             : (undef)
  verbatim              : 0

$ csv-check -v1 test.ssv --allow-loose-quotes -X
  allow_loose_quotes    : 1
...
  binary                : 1
  formula               : diag
  keep_meta_info        : 1

use Text::CSV_XS; # Text::CSV_XS is much faster that Text::CSV

...
    allow_loose_quotes => 1, # Should work. If not, maybe a bug in Tex
+t::CSV
    auto_diag          => 2, # Added
    });