change the v3 name of variablelengthstring to string

Author: d-v-b

src/zarr/core/dtype/__init__.py

@@ -166,7 +166,7 @@ def parse_data_type(
     if dtype_spec in VLEN_UTF8_ALIAS:
         # If the dtype request is one of the aliases for variable-length UTF-8 strings,
         # return that dtype.
-        return VariableLengthUTF8()
+        return VariableLengthUTF8()  # type: ignore[return-value]
     # otherwise, we have either a numpy dtype string, or a zarr v3 dtype string, and in either case
     # we can create a numpy dtype from it, and do the dtype inference from that
     return get_data_type_from_native_dtype(dtype_spec)  # type: ignore[arg-type]

src/zarr/core/dtype/npy/string.py

@@ -203,7 +203,7 @@ class UTF8Base(ZDType[TDType_co, str], HasObjectCodec):
     as data type, but as a base class for other variable length string data types.
     """
 
-    _zarr_v3_name: ClassVar[Literal["variable_length_utf8"]] = "variable_length_utf8"
+    _zarr_v3_name: ClassVar[Literal["string"]] = "string"
     object_codec_id: ClassVar[Literal["vlen-utf8"]] = "vlen-utf8"
 
     @classmethod
@@ -230,7 +230,7 @@ def _check_json_v2(
         )
 
     @classmethod
-    def _check_json_v3(cls, data: DTypeJSON) -> TypeGuard[Literal["variable_length_utf8"]]:
+    def _check_json_v3(cls, data: DTypeJSON) -> TypeGuard[Literal["string"]]:
         return data == cls._zarr_v3_name
 
     @classmethod
@@ -254,15 +254,14 @@ def to_json(
         self, zarr_format: Literal[2]
     ) -> DTypeConfig_V2[Literal["|O"], Literal["vlen-utf8"]]: ...
     @overload
-    def to_json(self, zarr_format: Literal[3]) -> Literal["variable_length_utf8"]: ...
+    def to_json(self, zarr_format: Literal[3]) -> Literal["string"]: ...
 
     def to_json(
         self, zarr_format: ZarrFormat
-    ) -> DTypeConfig_V2[Literal["|O"], Literal["vlen-utf8"]] | Literal["variable_length_utf8"]:
+    ) -> DTypeConfig_V2[Literal["|O"], Literal["vlen-utf8"]] | Literal["string"]:
         if zarr_format == 2:
             return {"name": "|O", "object_codec_id": self.object_codec_id}
         elif zarr_format == 3:
-            v3_unstable_dtype_warning(self)
             return self._zarr_v3_name
         raise ValueError(f"zarr_format must be 2 or 3, got {zarr_format}")  # pragma: no cover