📐rt-mixed-tally

The groupant beside tools/roundtrip/src/tally.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

Facts

Components

Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

Parts

• rt-mixed-tally-cell

Model text

descriptant

Descriptant

Prospective epoch

2026-10-31 source review predicted: Cell.add increments items/bits and keeps first4 examples. Residual.add lazily evaluates example only below cap; add_k adds kind count/bits. Merge adds all scalar/maps in fixed order and concatenates bounded example prefixes. Tally normal/whole remain separate Start maps. Resource model: Merge O(entries log destination keys + kind maps + bounded cloned examples); retained examples <=4 for normal constructed states, source oversized vectors scanned fully. External prospective.md predates test additions and preserves APIs, effect order, hazards and interaction hypotheses.

Observed epoch

Bounded real helper checks in tests.md constrain these models; syntax is a partial lexical projection with no macro expansion, name resolution or proof. Production expressions unchanged; six inline test modules added. Compiled mutants are temporary and exactly restored. Existing malformed-input and nonfinite domains remain explicit, not silently repaired. Parent composes this scope with siblings without adding overlapping costs twice.

Finite synthetic helper evidence only; live corpora, parser/model loading, full orchestration and filesystem failure races excluded.

approximant

Forward relation

Cell.add increments items/bits and keeps first4 examples. Residual.add lazily evaluates example only below cap; add_k adds kind count/bits. Merge adds all scalar/maps in fixed order and concatenates bounded example prefixes. Tally normal/whole remain separate Start maps.

Domain: Counts fit u64; finite floating metrics for mathematical additivity; f64 rounding means merge regrouping is not exact associativity. Input public fields can violate semantic inequalities.

invariant

Invariant and cost

Invariant

Counts fit u64; finite floating metrics for mathematical additivity; f64 rounding means merge regrouping is not exact associativity. Input public fields can violate semantic inequalities.

Cost

Merge O(entries log destination keys + kind maps + bounded cloned examples); retained examples <=4 for normal constructed states, source oversized vectors scanned fully.

Limits

Finite synthetic helper evidence only; live corpora, parser/model loading, full orchestration and filesystem failure races excluded. No percentage surrogate is implemented: categorical parsing/effect observations lack an admitted numerical error metric. Any future profile must define its metric/domain and use only1/2/5/10 percent caps.

composition

Local composition

Cell.add increments items/bits and keeps first4 examples. Residual.add lazily evaluates example only below cap; add_k adds kind count/bits. Merge adds all scalar/maps in fixed order and concatenates bounded example prefixes. Tally normal/whole remain separate Start maps.

Children select narrow source functions with their exact byte intervals. Remaining branches stay in the file model; fragments are not exhaustive partitions. Calls and state joins follow the forward relation, not folder order. Shared scans/helpers are counted once in whole-file costs. Complement of composition is not union of complements; reverse composition retains compatible intermediates and caller premises.

models

Typed source-bound relations

Subject: exact source SHA-256 in manifest. Domain and resource premises are in invariant.md. Each model is partial, source-derived, over a single helper invocation or the described finite trace. Complements are proposed inner exclusions under those premises; reverse relations retain all compatible antecedents, with no unique inverse claim. The oracle is the named checks in tests.md; unexecuted cases remain hypotheses. No numerical approximation certificate.

behavior_complement

Excluded: fifth normal add evaluates closure or preserves example; overflow/nonfinite values are validated. No validation exists for public fields.

reverse_reconstruction

Aggregates admit many ordered event histories; first4 examples constrain prefix only, counts/kinds constrain sums; merge cannot uniquely undo prior totals.

lazy_cap

Example closure runs only while destination examples.len()<KEEP; items/bits continue increasing.

merge_order

Example order follows merge order; counters commute mathematically but f64 accumulation order can differ.

kind_projection

Plain add has no kind; add_k increments shared Cell plus kind map once.

separate_starts

normal and whole counters retain different observation units even under same Start enum.

tests

Checks and evidence

Named source/helper checks: tally::wave32_tests::capped_examples_additive_metrics.

Wave32 on2026-10-31:10 distinct exact tests passed twice debug and twice release, with equal sorted named outcomes. This node claims only its listed subset; empty subset means source review only. Five actual source-behavior mutants compiled, failed assertions, restored exact bytes/hash, and passed focused green reruns. No assertion-only mutants; existing swapped-input controls are separate. Receipt bundle: $MOVA_DATA/runs/octopus-wave32-rt_mixed-2026-10-31 (native-commands.json, source-test-map.json, mutation-results.json, .status/.log). No live corpus, teacher, frozen assessment, download or production data used.

Finite synthetic helper evidence only; live corpora, parser/model loading, full orchestration and filesystem failure races excluded.

This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/roundtrip/src/tally.rs.groupant/