> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sifr.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# SIFR-INT-0009: JSON or web-safe integer serialization boundary is missing or unsafe.

> JSON or web-safe integer serialization boundary is missing or unsafe.

`SIFR-INT-0009` belongs to the **Integer model** diagnostic family. It means: jSON or web-safe integer serialization boundary is missing or unsafe.

## Why It Happens

Sifr separates exact integers from fixed-width integers. This diagnostic fires when an integer value, conversion, or operation violates that model.

<Info>
  Use `sifr --explain SIFR-INT-0009` locally to see the renderer's exact message template and any machine-applicable suggestions for the compiler version you are running.
</Info>

## Erroneous Code

```python theme={null}
class Payload:
    value: int

BOUNDARY = JsonIntegerBoundaryDescriptor(path="Payload.value")
```

## How To Fix It

Select `json.exact`, `json.web`, or `json.string_ints` and provide the declared integer kind and any required static range. Under `json.web`, numeric output must be statically proven to fit JavaScript's safe integer range; otherwise use the profile's decimal-string representation.

## Fixed Code

```python theme={null}
BOUNDARY = JsonIntegerBoundaryDescriptor(
    path="Payload.value",
    profile="json.web",
    representation="decimal_string",
)
```

## Details

| Field                  | Value                                              |
| ---------------------- | -------------------------------------------------- |
| Code                   | `SIFR-INT-0009`                                    |
| Family                 | `INT`                                              |
| Severity               | Error                                              |
| Stability              | stable                                             |
| Owner                  | `sifr_frontend::const_specialization`              |
| Representative fixture | `crates/sifr_frontend/src/const_specialization.rs` |

See the [Error Codes index](/diagnostics/error-codes) for the complete catalog.