Fix for Useless assignment to local variable

[Sija]

In general, to fix this kind of issue you either (a) remove the redundant initial assignment, or (b) collapse the declaration and first real assignment together so that the variable is declared without an unused default. This keeps the code’s behavior identical while eliminating dead stores.

Here, parsed is always assigned inside the if/else; we can safely remove the = NaN initializer and keep just let parsed;. JavaScript let declarations without initialization are legal, and both branches of the if/else guarantee that parsed receives a value before the subsequent Number.isNaN(parsed) check. No other code changes or imports are needed, and no external behavior changes.

Concretely, in runtime/src/decoders.js, change line 155 from let parsed = NaN; to let parsed;. All other lines remain unchanged.

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