ParseJson throws on primitive JSON and breaks FormatJson→ParseJson round-trips (Cannot read properties of undefined reading 'source')

### Environment - **brs-node** `1.9.9` and `1.10.0` (Node BrightScript bundle from this repo) - **Node** (e.g. v20.x) - Reproduced while running generated BrightScript that calls `ParseJson` / `FormatJson` via Hosanna’s `hs_bridge_core.brs` helpers. ### Summary `ParseJson` sometimes throws a **JavaScript** error inside the engine: `ParseJSON: Cannot read properties of undefined (reading 'source')` This shows up in two situations: 1. **JSON document that is only a number** (valid JSON: a primitive at the root). 2. **`ParseJson(FormatJson(obj))`** style round-trips (e.g. `structuredClone` implemented as parse after stringify). When `ParseJson` throws, BrightScript callers see **invalid** results and downstream code fails (e.g. `isNaN` checks on the parsed value, or property access on a clone that stayed `invalid`). --- ### Repro A — bare numeric JSON (minimal) BrightScript (or any code path that ends up calling `ParseJson` with this string): ```brightscript function main() ' Valid JSON text whose root value is a number — should parse to a number, not throw s = "1751259600000" x = ParseJson(s) ? x end function Expected: x is a numeric value; no runtime error. Actual: Error logged, e.g. ParseJSON: Cannot read properties of undefined (reading 'source') JS equivalent for comparison: JSON.parse("1751259600000") // => 1751259600000 Repro B — FormatJson → ParseJson round-trip function main() obj = { "a": 1, "b": { "c": 2 } } txt = FormatJson(obj, 512) clone = ParseJson(txt) ? clone.a end function Expected: clone is a valid associative array mirroring obj. Actual: Same class of ParseJson error at the ParseJson line (observed at hs_structuredClone-style code: clone = parseJSON(formatJSON(obj))). ``` Notes The failure is in the engine’s ParseJson implementation (stack originates from JS, not BrightScript syntax). brs-engine 1.8.9 (bin/brs.node.js) does not exhibit this for our call sites; brs-node 1.9.9 / 1.10.0 do. Impact Any host that relies on ParseJson for arbitrary JSON text (including primitive roots) or on stringify→parse cloning is affected. Thanks for looking at this.