# 1.0.0-beta.17 JSON Primitive Scalar Parsing Foundation

## Scope

Slovo-facing `1.0.0-beta.17` adds narrow `std.json` facade names for primitive
scalar token parsing:

- `parse_bool_value_result ((token string)) -> (result bool i32)`
- `parse_i32_value_result ((token string)) -> (result i32 i32)`
- `parse_u32_value_result ((token string)) -> (result u32 i32)`
- `parse_i64_value_result ((token string)) -> (result i64 i32)`
- `parse_u64_value_result ((token string)) -> (result u64 i32)`
- `parse_f64_value_result ((token string)) -> (result f64 i32)`
- `parse_null_value_result ((token string)) -> (result bool i32)`

The construction surface from `1.0.0-beta.7` remains intact: the existing 24
JSON construction exports are still present.

## Contract

These helpers parse one already-isolated primitive scalar token. Success
returns `ok payload`; ordinary parse failure returns `err 1`.
`parse_null_value_result` returns `ok true` only for exact `null` and `err 1`
otherwise.

Numeric and boolean conversion is intentionally concrete and result-returning.
The promoted numeric and boolean helpers consume a whole JSON primitive token:
no leading/trailing whitespace, no leading `+`, no leading-zero integer form
except `0`, and no non-finite f64 values. `parse_f64_value_result` accepts the
current JSON-number grammar subset implemented by the runtime, including
exponent notation. This slice does not freeze a stable API or ABI.

## Non-Scope

This is not full JSON parsing. It does not add `parse_string`, `parse_object`,
`parse_array`, `parse_value`, tokenizers, recursive `JsonValue`, maps/sets,
generic parse APIs, whitespace-tolerant document parsing, schema validation,
streaming, Unicode escape handling, stable API freeze, stable ABI/layout, or
performance claims.