move unstable spec warning to errors

Author: d-v-b

src/zarr/core/dtype/common.py

@@ -16,7 +16,7 @@
 from typing_extensions import ReadOnly
 
 from zarr.core.common import NamedConfig
-from zarr.errors import ZarrFutureWarning
+from zarr.errors import UnstableSpecificationWarning
 
 EndiannessStr = Literal["little", "big"]
 ENDIANNESS_STR: Final = "little", "big"
@@ -217,9 +217,6 @@ class HasObjectCodec:
     object_codec_id: ClassVar[str]
 
 
-class UnstableSpecificationWarning(ZarrFutureWarning): ...
-
-
 def v3_unstable_dtype_warning(dtype: object) -> None:
     """
     Emit this warning when a data type does not have a stable zarr v3 spec

src/zarr/errors.py

@@ -92,3 +92,6 @@ class ZarrRuntimeWarning(RuntimeWarning):
     """
     A warning for dubious runtime behavior.
     """
+
+
+class UnstableSpecificationWarning(ZarrFutureWarning): ...

tests/test_dtype/test_npy/test_bytes.py

@@ -2,8 +2,8 @@
 import pytest
 
 from tests.test_dtype.test_wrapper import BaseTestZDType
-from zarr.core.dtype.common import UnstableSpecificationWarning
 from zarr.core.dtype.npy.bytes import NullTerminatedBytes, RawBytes, VariableLengthBytes
+from zarr.errors import UnstableSpecificationWarning
 
 
 class TestNullTerminatedBytes(BaseTestZDType):

tests/test_dtype/test_npy/test_string.py

@@ -5,8 +5,8 @@
 
 from tests.test_dtype.test_wrapper import BaseTestZDType
 from zarr.core.dtype import FixedLengthUTF32
-from zarr.core.dtype.common import UnstableSpecificationWarning
 from zarr.core.dtype.npy.string import _NUMPY_SUPPORTS_VLEN_STRING, VariableLengthUTF8
+from zarr.errors import UnstableSpecificationWarning
 
 if _NUMPY_SUPPORTS_VLEN_STRING: