--- title: "roundtrip-class-coding — Mova code model" description: "Mova code model of tools/roundtrip/src/class.rs: components with their labels, obernants and the model text." url: "https://groupants.elamur.ai/free/en/mova/tools/roundtrip/src/class.rs.groupant/coding.groupant/" --- Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants** This page as HTML: # roundtrip-class-coding The groupant beside tools/roundtrip/src/class.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 - **kind:** groupant_fragment - **status:** partial source bound model - **source:** [`tools/roundtrip/src/class.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/roundtrip/src/class.rs) - **source SHA-256:** `1b8466551077c2f4…` - **covers:** Diagnostic bit costs (bytes 8926–10611) - **part of:** [roundtrip-class](https://md.groupants.elamur.ai/free/en/mova/tools/roundtrip/src/class.rs.groupant/) - **repository folder:** [`tools/roundtrip/src/class.rs.groupant/coding.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/roundtrip/src/class.rs.groupant/coding.groupant) - **repository commit:** `855da7bd4a7b` > **Implementation material.** A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised. ## Components | component | label | where | |---|---|---| | **approximant** | partial | [approximant](#approximant) | | **ast** | partial | `../syntax.json` | | **cost** | partial | [invariant-and-cost](#invariant-and-cost) | | **descriptant** | present | [descriptant](#descriptant) | | **invariant** | partial | [invariant-and-cost](#invariant-and-cost) | | **tests** | bounded checks | [tests](#tests) | ## 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. | id | type | label | where | |---|---|---|---| | `behavior_complement` | behavior_complement | partial source derived model | [behavior_complement](#behavior-complement) | | `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) | | `unicode_cost` | unicode_cost | partial source derived model | [unicode_cost](#unicode-cost) | | `position_domain` | position_domain | partial source derived model | [position_domain](#position-domain) | | `lexicon_state` | lexicon_state | partial source derived model | [lexicon_state](#lexicon-state) | | `scope_precondition` | scope_precondition | partial source derived model | [scope_precondition](#scope-precondition) | ## Model text ### descriptant #### Diagnostic bit costs 2026-10-31 epoch: source scope bytes [8926,10611); Hebrew scalar weighting and dictionary membership set costs; finite f64 approximations are not executable compression lengths. No annotator/model loading, live corpus, full suite, teacher, GPU or persistent-learning evidence. No executable percentage surrogate: categorical codecs/effects need a useful metric before future caps 1/2/5/10%. ### approximant #### Diagnostic bit costs Hebrew scalar weighting and dictionary membership set costs; finite f64 approximations are not executable compression lengths. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. ### catalog ### behavior_complement Subject: roundtrip-class-coding, source hash 1b8466551077c2f42748e0d08084307cc8bbaff3f62fbe2597eced4b75221f36, transition observation. For Diagnostic bit costs, excluded transitions violate the stated scoped rule: Hebrew scalar weighting and dictionary membership set costs; finite f64 approximations are not executable compression lengths. This is an inner source-derived exclusion under the domain, not a complement of arbitrary unseen runtime behavior. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Status: partial source-derived model. ### reverse_reconstruction Subject: roundtrip-class-coding, source hash 1b8466551077c2f42748e0d08084307cc8bbaff3f62fbe2597eced4b75221f36, transition observation. Fix outputs and post-state of coding; compatible antecedents are all scoped inputs/pre-state satisfying: Hebrew scalar weighting and dictionary membership set costs; finite f64 approximations are not executable compression lengths. Fields outside this byte scope are held fixed; discarded fields remain ambiguous. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Status: partial source-derived model. ### unicode_cost Subject: roundtrip-class-coding, source hash 1b8466551077c2f42748e0d08084307cc8bbaff3f62fbe2597eced4b75221f36, transition observation. lit_bits(empty)=0 and lit_bits(Hebrew+a+emoji)=48; this differs from UTF-8 storage bytes and is a declared diagnostic coding convention. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Status: partial source-derived model. ### position_domain Subject: roundtrip-class-coding, source hash 1b8466551077c2f42748e0d08084307cc8bbaff3f62fbe2597eced4b75221f36, transition observation. pos_bits(n)=log2(n+1) on nonoverflowing n; n=0 costs zero. usize::MAX is outside modeled domain, with debug/release overflow divergence. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Status: partial source-derived model. ### lexicon_state Subject: roundtrip-class-coding, source hash 1b8466551077c2f42748e0d08084307cc8bbaff3f62fbe2597eced4b75221f36, transition observation. Known English lemma costs17; Hebrew present in initialized nonempty HEB_LEMMAS costs log2(size), else literal. This global one-time vocabulary is external state, not learning by this call. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Status: partial source-derived model. ### scope_precondition Subject: roundtrip-class-coding, source hash 1b8466551077c2f42748e0d08084307cc8bbaff3f62fbe2597eced4b75221f36, transition observation. Diagnostic bit costs requires the coordinate/state assumptions of this fragment; inspect its exact byte range. Hebrew scalar weighting and dictionary membership set costs; finite f64 approximations are not executable compression lengths. Invalid arbitrary state is outside the reconstruction law. Domain: bounded synthetic values, valid source-specific coordinates, nonoverflowing counts, available allocation; fixed environment controls. Relations are source-derived partial models with finite checks, not universal proofs. Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Status: partial source-derived model. ### tests #### Scoped evidence Evidence: external wave32 rt_core receipt includes native-commands.json, exact named outcomes twice debug/twice release, raw status/log files, compiled production controls with byte restoration and paired syntax. Only named synthetic helpers execute; model_path/export and live CLI paths have representation/source evidence. Coverage is limited to this fragment's reached branches; parent tests do not prove every scoped branch. ### invariant-and-cost #### Scoped invariant and cost Hebrew scalar weighting and dictionary membership set costs; finite f64 approximations are not executable compression lengths. of_word O(B) lowercase plus fixed-list comparisons. lit_bits O(B); perm_bits O(k), O(1) extra state. pos_bits requires n