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Description
Minimal example:
import zarr
a = zarr.create((1,), dtype=bytes)
a[0] = b''
assert a[0] == b''
Traceback (most recent call last):
File "example.py", line 5, in <module>
assert a[0] == b''
AssertionErrorThe value of a[0] is actually 0, when it should be b''.
Found by one of our users at tskit-dev/tsinfer#628 this bug was introduced in the latest release (v2.11.0) in this commit: f461eb7 when the default for write_empty_chunks was changed to False. The default fill_value for arrays created via zarr.creation.create is 0, so when an empty, unwritten chunk is re-created the previous value b'' becomes 0. I assume this fill_value should be None.
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