Function bigVals

src/compute-engine/library/statistics.ts:851–855

(vals: ReadonlyArray<Expression>)

        // SYMBOLIC data (a valueless symbol, an unresolved expression) has no
        // numeric reading: stay inert rather than sort NaN placeholders into
        // the quantile split and bake a definite `(…, NaN, …)` tuple that a
        // later assignment contradicts. See `collectData`, which is the rule
        // the whole aggregate family shares — and whose single walk feeds both
        // the exact and the float path below.
        const xs = collectData(ops);
        if (xs === null) return undefined;
        const nonReal = nonRealUnivariateError(engine, 'Quartiles', xs);
        if (nonReal) return nonReal;