Root metadata documents that carry a node's attributes, NEWEST FORMAT FIRST.
Format 3 nests attributes inside zarr.json; format 2 uses a separate
.zattrs. Luxar writes 3 while existing stores stay 2, so a probe has to
accept either — and tries zarr.json first because that is what new datasets
are, making the second request the exception rather than the rule.
Root metadata documents that carry a node's attributes, NEWEST FORMAT FIRST.
Format 3 nests attributes inside
zarr.json; format 2 uses a separate.zattrs. Luxar writes 3 while existing stores stay 2, so a probe has to accept either — and trieszarr.jsonfirst because that is what new datasets are, making the second request the exception rather than the rule.