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03e368d7 - Escape subfields. (#3220)

Escape subfields. (#3220) * Update croissant_crumbs.py * Update croissant_utils.py * Update croissant_crumbs.py * Update croissant_utils.py * Update croissant_utils.py * Update croissant_utils.py * Update test_croissant_utils.py * Update test_croissant_utils.py * Address comments * Update test_croissant_utils.py * Fix format and tests * Fix format and tests for croissant_utils.py * Fix test.