relplot must assign a list or a column name in the "size" parameter

[FrankBGao]

https://seaborn.pydata.org/examples/scatter_bubbles.html

import seaborn as sns
sns.set_theme(style="white")

mpg = sns.load_dataset("mpg")

sns.relplot(x="horsepower", y="mpg", hue="origin", size="weight",
            sizes=(40, 400), alpha=.5, palette="muted",
            height=6, data=mpg)

In the version 0.10.0, I could assign size=1, in the sns.relplot(), there is no error.
In the version 0.10.1, I will gain an error "TypeError: object of type 'int' has no len()".
I must assign size be "size=[1] * len(mpg)".

[mwaskom]

Duplicate of #2279