`request.security_lower_tf(..., ignore_invalid_timeframe=true)` returns scalar NaN where a tuple of arrays is expected

[port2life]

Environment

• PineTS 0.9.28, Node v25.9.0, chart timeframe "1" (1-minute), plain OHLC candles.

Minimal reproduction (chart TF = 1m, so the requested "5" is higher, i.e. invalid for LTF)

//@version=6
indicator("repro")
[h, l, t] = request.security_lower_tf(syminfo.tickerid, "5", [high, low, time], ignore_invalid_timeframe = true)
plot(array.size(h))

Observed

Cannot read properties of undefined (reading 'size')

Expected

With ignore_invalid_timeframe = true, TradingView returns empty arrays — the script's
own array.size(...) == 0 guards then work. It must not throw.

Analysis (from the published source map)

security_lower_tf.ts (~line 327): if (reqTimeframeIdx > ctxTimeframeIdx) { if (_ignore_invalid_timeframe) return NaN; ... } — a scalar NaN where the tuple contract
requires the nested-array shape produced by the function's own same-timeframe branch a
few lines below. The transpiled destructure then yields undefined for each element and
the first array.* consumer throws.

Suggested fix

Return the same shape as the same-timeframe branch but with empty PineArrayObjects
(one per requested tuple element) — Pine-faithful, and lets user guards fire.