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Unknown fields, native records, and 0.4.0 - #1
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Kiwi data is not self-describing, so generated decoders rejected any message field their compiled schema lacked. Current Figma files carry up to ~200 such fields. With unknown_fields: :runtime_schema, decoders read the schema shipped with the data and skip those fields instead; the default still rejects them.
KiwiCodec.decode/3 takes the schema the data was written with and steps over message fields the generated modules lack, matching the Rustler runtime-schema mode.
Sparse decoders created the module, __kiwi_module__, and field-name atoms from their text for every map they built, taking the VM's atom table lock and hashing the name each time; that was two thirds of decoding large files. kiwi_atom caches them by the static name's address, per scheduler thread over a shared process-wide map, since atoms are never freed.
The :records feature decodes Kiwi data into records Rust code can read, change, and share without building Elixir terms, then encodes them as the sparse maps generated decoders return, optionally only some fields. The record runtime is schema-independent; the schema supplies a definition table and constants naming each definition and field.
Generated record constants now name enum values as well as definitions and fields, and records gain typed getters (record, records, array, str, bool, uint, int, float, enum_value) for code reading them.
An enum variant or field named DEFINITION collided with the definition index constant; definition indexes now live in kiwi_record_definitions.
put_record, put_records, map_record, and map_records update nested records without spelling out the value wrapping.
put_bool, put_uint, put_float, put_str, put_floats, floats, and field_ids let generated code build and rescale records without spelling out KiwiValue variants.
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Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 65.79% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 76 functions across 28 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly identifies the main changes: unknown-field handling, native records, and the 0.4.0 release. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 65.79% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 76 functions across 28 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @lib/kiwi_codec/decoder.ex:
- Around line 74-76: Update skip_unknown_field/4 to rescue schema lookup and
malformed-data failures (ArgumentError, FunctionClauseError, and MatchError) and
re-raise them as KiwiCodec.DecodeError, including context for the unknown field
and original error.
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📒 Files selected for processing: 21
CHANGELOG.mdREADME.mdcodegen/kiwi_codec/rustler_generator.excodegen/kiwi_codec/rustler_generator/atom_cache.excodegen/kiwi_codec/rustler_generator/decoder_macro.excodegen/kiwi_codec/rustler_generator/full_decoder_helpers.excodegen/kiwi_codec/rustler_generator/records.excodegen/kiwi_codec/rustler_generator/skip_helpers.excodegen/kiwi_codec/rustler_generator/skip_value_helpers.excodegen/kiwi_codec/rustler_generator/sparse_helpers.excodegen/kiwi_codec/rustler_generator/splice.excodegen/kiwi_codec/rustler_generator/templates/atom_cache.rscodegen/kiwi_codec/rustler_generator/templates/records_runtime.rscodegen/kiwi_codec/rustler_generator/templates/unknown_field_runtime_schema.rscodegen/kiwi_codec/rustler_generator/unknown_fields.exlib/kiwi_codec.exlib/kiwi_codec/decoder.exlib/kiwi_codec/schema_interpreter.exmix.exstest/rustler_generator_test.exstest/schema_evolution_test.exs
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This was referenced Oct 23, 2026
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Prepares kiwi_codec 0.4.0, built against RustQ 1.0.0-rc.12.
:unknown_fieldsgenerator option andKiwiCodec.decode/3's:schemaoption skip fields a newer, compatible schema added, instead of rejecting the data.:recordsgenerator feature: native records Rust code can read, change, and share before encoding them as sparse maps, with generated definition, field, and enum constants, typed getters, and update helpers.~> 1.0.0-rc.12for code generation; the production package still has no runtime dependencies.See the CHANGELOG for details.
mix cipasses locally against RustQ 1.0.0-rc.12 from Hex.Summary by CodeRabbit