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…add definitions with union `ZarrV3Context.update(**slots)` and `ZarrV2Context.update(**slots)` read as a merge, but replace each slot whole, so passing one new definition silently dropped every default. They become `copy(*, update=None)`, after pydantic's `model_copy(update=...)`, whose replace-whole meaning pydantic users already know. Adding definitions is `union`, which keeps every definition the scope has and refuses a conflicting one; the docs, docstrings and call sites now use it instead of splicing a slot's definitions back in. Fixes #424 Assisted-by: ClaudeCode:claude-opus-5-5
…ts PR Assisted-by: ClaudeCode:claude-opus-5-5
…elopers#4597) * feat(zarr-metadata): draw nested fields and codec pipelines Add Hypothesis strategies for struct, cast_value and sharding_indexed, which draw the fields they hold from the same Strategies mapping, and a `pipelines` strategy that walks a codec pipeline, drawing each codec for the chunk the codec before it hands on via its definition's transition. A shard's inner and index pipelines are drawn for the chunks its definition's `pipelines` gives. Shards and structs nest at most one level deep, and strategies are wrapped in a mapping with a short repr so Hypothesis's error notes stay under its 30,000-character warning. Every strategy record's functions now take the Strategies mapping as their last argument. Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): reject non-numeric data types in arithmetic codecs `NOT_NUMBERS` predates the zarr-python data types, so `cast_value` and `scale_offset` accepted `fixed_length_utf32`, `null_terminated_bytes`, `raw_bytes` and `variable_length_bytes`, and the strategies drew them. The cast_value spec defines the codec only for floating-point and integral data types. Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): let the later of two same-named strategies win `_scope` documented this but raised `ScopeConflictError`, so `declarations` failed for any definition named as a default, which worked before this branch. Pipelines and data type names now draw only the definition that claims a name, and `declarations` reads a draw with its own definition claiming the name. Assisted-by: ClaudeCode:claude-opus-5-5 * test(zarr-metadata): check a same-named definition reads its own draws The test compared a draw with the bare name, which depended on the example Hypothesis returned and said nothing of which definition read it. Every spelling is now read by the definition it was drawn for. Assisted-by: ClaudeCode:claude-opus-5-5 * chore(zarr-metadata): number the nested strategies changelog fragments after zarr-developers#4597 Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): keep same-named definitions out of nested draws The struct and shard strategies removed the default definition by identity before drawing what they hold. A custom definition with the same name stayed in the inner strategies, so it could claim the name there and be drawn, and the default then refused the result with a ValueError. Filter by name instead. Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): draw long runs in rectilinear dimensions A run held at most 4 chunks, so the `[size, count]` spelling was never drawn for what it is for, and a long dimension was covered by a few small chunks and one huge one. Draw counts sized to the dimension, and always write a run too long to list as a pair. Reach tests now cover each spelling of a dimension, not only that a pair is drawn at all. Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): sample float fills, shard factors and struct fields evenly A measured audit found strategies that drew valid metadata from little of what they could. Hex float fills came from a small-biased integer, so 83% of float64 fills were subnormal and few were normal. Integer float fills stopped at the limit of the narrowest type. Rectilinear edges rarely shared a factor, so 70% of a shard's axes held inner chunks of length 1. A struct field's type was drawn after its name, which made the first data type about a fifth of all fields. Draw hex fills from floats, infinities and NaN payloads as well as raw bits, limit integers by width, draw edges with a common factor, and draw a field's type first. Divisor search is now bounded, so a very long shard no longer takes billions of steps. New tests measure shares at the number of examples a test runs, which plain reach tests do not see. Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): keep regular chunk lengths within a signed 64-bit size Axes can be up to 2**63 - 1 long, but regular and bare rectilinear chunk lengths reached twice that, which a reader indexing with int64 cannot hold. Cap them. A rectilinear last edge needs no cap: the runs before it cover at least one factor, so rounding up cannot pass the axis. Correct two docstrings, and require a covering run to count more than one chunk in its reach test, since the leftover edge passed it on its own. Assisted-by: ClaudeCode:claude-opus-5-5 * fix(zarr-metadata): draw non-finite and hex scale_offset values An offset and a scale are fill values of the chunk's data type, but the strategy drew only finite floats, and never an integer spelling. It now draws every spelling a fill value takes, and still never a scale of zero. Assisted-by: ClaudeCode:claude-opus-5-5
…r-9bd090 Main renamed the scopes to *_CONTEXT and fields to declarations, and added scope update call sites (ZARR_PYTHON_CONTEXT, fixed_length_utf32, the vlen codecs). Conflicts take main's side, then rewrite each scope update into union (when it splices a slot's definitions back in) or copy(update=...), and restore this branch's copy/union docs under the new names. Assisted-by: ClaudeCode:claude-opus-5-5
…nd name copy in scope docstrings Assisted-by: ClaudeCode:claude-opus-5-5
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ZarrV3Context.update(**slots)andZarrV2Context.update(**slots)withcopy(*, update=None), after pydantic'smodel_copy(update=...):context.update(codecs=[...])becomescontext.copy(update={"codecs": [...]}), and still replaces each slot it is given whole. To add definitions to a scope and keep the ones it has, useunion:CORE_AND_EXTENSIONS.union(ZarrV3Context(data_types=[MY_DATA_TYPE])), which the docs now show in place of splicing a slot's definitions back in.Fixes #424.
copy's docstring warns thatcopy(update={"codecs": [X]})leavesXas the only codec and points atunion; the docstrings ofunion, the scope classes and thedefinitionpackage overview nameunionas the way to add definitions.CORE_AND_EXTENSIONSis now built withCORE.union(...). About 50 test call sites moved: splices of a slot's own definitions becameunion, and replacements by name becamecopy(update=...).test_union_adds_definitions_and_keeps_every_one_the_scope_has, covers the case in the issue.ZarrV3ArrayMetadataand friends) keep their ownupdate(**members), which has the same replace-whole meaning. The agent left them alone, so the two operations now have different names.just checkinpackages/zarr-metadatapasses: ruff, pyright, the tests on Python 3.11 and the newest supported version, and the strict docs build.🤖 Generated with Claude Code