fix typing with Optional[]

Author: brokkoli71

zarrita/codecs.py

@@ -547,7 +547,7 @@ def compute_encoded_size(self, input_byte_length: int) -> int:
 
 
 def blosc_codec(
-    typesize: int | None = None,
+    typesize: Optional[int] = None,
     cname: Literal["lz4", "lz4hc", "blosclz", "zstd", "snappy", "zlib"] = "zstd",
     clevel: int = 5,
     shuffle: Literal["noshuffle", "shuffle", "bitshuffle"] = "noshuffle",

zarrita/metadata.py

@@ -149,7 +149,7 @@ def encode_chunk_key(self, chunk_coords: ChunkCoords) -> str:
 
 @frozen
 class BloscCodecConfigurationMetadata:
-    typesize: int | None = None
+    typesize: Optional[int] = None
     cname: Literal["lz4", "lz4hc", "blosclz", "zstd", "snappy", "zlib"] = "zstd"
     clevel: int = 5
     shuffle: BloscShuffle = "noshuffle"