Strange animation behavior with improperly specified color

When a scatter line color is specified using rgb() with float values in [0, 1] rather than integers in [0, 255], it seems to actually produce the expected color. However, when animating a scatter trace with a constant color specified this way, it turns to black during the animation. If the animation sets redraw=True it will go back to the "correct" color after the transition completes, but if redraw=False then it stays black.

Here's a colab that demonstrates the issue: https://colab.research.google.com/drive/1enQGu6ProJg22F9KxAwsewf7UvbS3fkF?usp=sharing

I'm not sure if the correct fix to this is to make the animations work the same way as for correctly specified colors or to make incorrectly specified colors always show up as black (i.e. get cast to ints) or raise an error. The current situation results in a difficult to debug behavior.

从链接的 Colab 复现开始，比较使用 rgb() float 值并分别设置 redraw=True 和 redraw=False 的 scatter 动画。跟踪常量颜色在动画过程中与 redraw 之后的处理方式，然后确定格式错误的颜色值应当被规范化、拒绝，还是以一致的方式处理。