Could subplot have explicit error when ncols is passed?

I just tried to use subplot in a shiny app, and naively assumed that there would be an ncols argument corresponding to nrows - evidently, that is not really needed, but an error message clearer than Error in [[: subscript out of bounds would have saved me a lot of confusion. Might still be worth making this explicit? (Or - though that might be too much of a change - require all ... arguments to be unnamed?)

library(plotly)
p1 <- plot_ly(economics, x = ~date, y = ~uempmed)
p2 <- plot_ly(economics, x = ~date, y = ~unemploy)
subplot(p1, p2, ncols = 2)
#> Error in plots[[i]][["frames"]]: subscript out of bounds

^{Created on 2024-05-09 with reprex v2.0.2}

Empieza reproduciendo el ejemplo de R proporcionado en el punto de entrada de subplot e inspecciona cómo se gestiona el argumento ncols. Se considera terminado cuando pasar ncols ya no produce el error subscript-out-of-bounds, sino que muestra un mensaje claro e intencionado; ten en cuenta el comportamiento existente de subplot descrito en el issue al comprobar el resultado.