spurious warning when mapping marker size

The simple scatterplot has a third variable mapped to the marker/point size. The plot looks perfect to me, but it throws a warning about multiple values. Each x & y value has exactly one size value.

Other than suppressing the warning, can a respecify this graph so it does not throw the warning?

Warning message:
`line.width` does not currently support multiple values.

Code:

plotly::plot_ly(
  data  = iris, 
  x     = ~Sepal.Length, 
  y     = ~Petal.Length, 
  size  = ~Sepal.Width,
  type  = 'scatter', 
  mode  = 'markers'
)

Graph:

Originally posted at https://stackoverflow.com/questions/52692760/spurious-warning-when-mapping-marker-size-in-plotly-r.

Reproduisez l’avertissement avec le nuage de points plotly::plot_ly() fourni, en utilisant iris et le mappage de taille de Sepal.Width. Suivez la gestion de la taille des marqueurs du nuage de points ainsi que l’avertissement signalé concernant line.width. Le travail est terminé lorsque le graphique conserve les tailles de marqueurs mappées sans émettre l’avertissement parasite de valeurs multiples.