str[n] vs. utc[n] ?

[jbrezmorf]

Just check that we use UTC or enable distiguihing ASCII and UTC.
Documentation.

[jbrezmorf]

In fact zarr specification is unable to store UTF. Haing an utf character in the string leads to:

WARNING:py.warnings:/home/hlavo/miniconda3/envs/hlavo/lib/python3.11/site-packages/zarr/core/dtype/npy/string.py:249: UnstableSpecificationWarning: The data type (FixedLengthUTF32(length=16, endianness='little')) does not have a Zarr V3 specification. That means that the representation of arrays saved with this data type may change without warning in a future version of Zarr Python. Arrays stored with this data type may be unreadable by other Zarr libraries. Use this data type at your own risk! Check https://github.com/zarr-developers/zarr-extensions/tree/main/data-types for the status of data type specifications for Zarr V3.
  v3_unstable_dtype_warning(self)