refactor(api): build zarr.open, open_array and open_group on one metadata reader - #4366

Draft

d-v-b wants to merge 10 commits into

zarr-developers:mainfrom

d-v-b:claude/open-single-probe-v2

Commits on Sep 16, 2026

perf(api): read metadata once when zarr.open falls back to a group
d-v-b
committed
a110f50
docs: add changelog fragment for #4366
d-v-b
committed
aa760ce
refactor(array): derive from_zarr_json instead of storing it
d-v-b
committed
14663af
refactor(array): make _MetadataDocs a TypedDict so presence means "read"
d-v-b
committed
358672b
refactor(array): report what the probe found as a node_type literal
d-v-b
committed
e3a89c9
refactor(array): model the reads as state and interpret them with plain functions
d-v-b
committed
0ddfcfd
perf(group): read only what the found format needs after a pre-fetch
d-v-b
committed
387c192
perf(api): give zarr.open a Zarr format 3 path and a format 2 fallback
d-v-b
committed
821cc21
refactor(api): build zarr.open, open_array and open_group on one metadata reader
d-v-b
committed
3498a97
refactor(group): compose read_node_metadata from per-format readers
d-v-b
committed
80243e9