MOD-14010 support Homogenues array floating point forcing(deserializa…

[AvivDavid23]

…tion path only)

• Add Option to try and enforce specific float type in a value for a homogenues array
• Add binary encoding and decoding, which will be used by RedisJson(to easily preserve the tag per path)
• Add tests, fuzz tests

no production-quality Rust CBOR library implements RFC 8746 natively (the only candidate, cbor_enhanced, has been unmaintained since 2020 and lacks F16-LE and BF16 support), so a thin IValue ↔ ciborium::Value conversion layer is still needed

Size comparison (vs JSON baseline)

Document	JSON	CBOR	CBOR+zstd
FP32 array (1000 elements)	19 180 B	4 005 B (−79%)	3 593 B (−81%)
FP64 array (1000 elements)	5 891 B	8 005 B (+36%)	2 359 B (−60%)
Heterogeneous array (1000 nums)	5 891 B	8 005 B (+36%)	2 359 B (−60%)
String-heavy object (50 keys)	2 181 B	2 032 B (−7%)	191 B (−91%)
Mixed object	94 B	59 B (−37%)	68 B (−28%)
Nested FP32 arrays + string	3 110 B	826 B (−73%)	338 B (−89%)
Big mixed JSON (200 records)	77 190 B	66 068 B (−14%)	17 777 B (−77%)
Repeated strings / RED-141886	49 276 B	37 190 B (−25%)	2 418 B (−95%)

---

Example payloads

1 — FP32 typed array (1 000 elements, stored with FPHA F32 tag)

[0.0, 0.001, 0.002, 0.003, 0.004, ...]   // 1 000 floats total

2 — FP64 typed array (1 000 elements, stored with FPHA F64 tag)

[0.0, 0.001, 0.002, ...]   // 1 000 doubles total

3 — Heterogeneous float array (same data, no FPHA hint)

Same JSON as above; without an FPHA hint the array is stored as ArrayHetero
(each element tagged individually). zstd still achieves the same ratio because
the repeated tag bytes compress well.

4 — String-heavy object (50 keys)

{
  "key_0": "value_0_some_longer_string_here",
  "key_1": "value_1_some_longer_string_here",
  "key_2": "value_2_some_longer_string_here",
  ...   // 50 keys total
}

5 — Small mixed object

{
  "name": "Alice",
  "age": 30,
  "scores": [1, 2, 3, null, true, "bonus"],
  "meta": {"active": true, "level": 42}
}

6 — Nested FP32 arrays + string

{
  "a": [0.0, 0.1, 0.2, ...],   // 100 F32 elements
  "b": [0.0, 0.1, 0.2, ...],   // 100 F32 elements
  "label": "test"
}

7 — Big mixed JSON (200 records, heterogeneous embeddings)

[
  {
    "id": 0, "name": "user_0", "active": true, "score": 0.0,
    "tags": ["alpha", "beta", "gamma"],
    "embedding": [0.0, 0.001, 0.002, ...]   // 32 floats
  },
  // ... 200 records total, repeated schema
]

The repeated key names ("id", "name", "active", "score", "tags", "embedding")
across 200 records are what zstd compresses so aggressively here.

8 — Repeated-string records (500 records, RED-141886 scenario)

[
  {"id": 0, "status": "active",   "region": "us-east-1", "tier": "free",     "owner": "team-a", "count": 0},
  {"id": 1, "status": "inactive", "region": "eu-west-1", "tier": "standard", "owner": "team-b", "count": 10},
  // ... 500 records; status/region/tier/owner values repeat from a small fixed set
]

---

Note

High Risk
Adds new CBOR/zstd encoding and changes core IArray fallible APIs to return a new IJsonError, which can affect downstream callers and data interchange correctness.

Overview
Adds optional floating-point homogeneous array (FPHA) enforcement during JSON deserialization via FPHAConfig/IValueDeserSeed, plus IArray::push_with_fp_type to force F16/BF16/F32/F64 storage and reject out-of-range values.

Introduces a new cbor module with encode/decode and zstd-compressed variants that preserve typed array tags using RFC 8746 (with a private BF16 tag), and surfaces this API from lib.rs.

Refactors array-related fallible APIs to return IJsonError (wrapping allocation failures and new range errors), adds extensive unit tests, and expands CI fuzzing to cover CBOR decode + round-trip (with updated fuzz runtime/memory flags).

^{Written by Cursor Bugbot for commit 9675e63. This will update automatically on new commits. Configure here.}

[galcohen-redislabs]

Did you look at c2pa_cbor?

[AvivDavid23]

Did you look at c2pa_cbor?

@galcohen-redislabs I can try that, although it doesnt have a major release, and very low usage:

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}