23E8          ; valid                  ;      ; NV8    # 5.2  DECIMAL EXPONENT SYMBOL
23E9..23F3    ; valid                  ;      ; NV8    # 6.0  BLACK RIGHT-POINTING DOUBLE TRIANGLE..HOURGLASS WITH FLOWING SAND
23F4..23FA    ; valid                  ;      ; NV8    # 7.0  BLACK MEDIUM LEFT-POINTING TRIANGLE..BLACK CIRCLE FOR RECORD
23FB..23FE    ; valid                  ;      ; NV8    # 9.0  POWER SYMBOL..POWER SLEEP SYMBOL

  }];

  let description = [{
result is one logical checkpoint, with one physical metadata file and renamed
data files.

Intended for "grouping" multiple checkpoints in a sharded checkpoint setup.

If delete_old_dirs is true, attempts to delete recursively the dirname of each
path in the input checkpoint_prefixes.  This is useful when those paths are non