Execution example:

normalize   'NormalizerNFKC("unify_katakana_du_small_sounds", true)'   "ヅァヅィヅェヅォ"   WITH_TYPES
# [
#   [
#     0,
#     1337566253.89858,
#     0.000355720520019531
#   ],
#   {
#     "normalized": "ザジゼゾ",
#     "types": [
#       "katakana",
#       "katakana",
#       "katakana",
#       "katakana",
#       "null"
#     ],
#     "checks": [
#
#     ]
#   }
# ]