crosstalk equality

I discovered this as I worked through an example of linking leaflet with DT and plotly through crosstalk (example). It seems plotly converts crosstalk keys to String and then uses exact equality match .indexOf (see lines). Thinking through how best to solve this, I came up with the following:

1. Not convert crosstalk key to string in plotly, but I am guessing there was a reason to do the conversion for plotly traces.

2. Perform match using something other than indexOf or ===. For the purposes of my example I used [].filter, but this is inefficient.

3. Expect other htmlwidget authors to also convert to string, or add both the string and non-string forms to crosstalk select.

在 experiments/select_crosstalk.R 中重现链接的 crosstalk 示例，并检查 plotly.js 第 739 行引用的匹配逻辑。比较 leaflet、DT 和 plotly 使用的键表示形式，然后在进行任何更改之前，确定整个示例中应保持一致的匹配行为。完成标准是链接的 widgets 能够可靠地选择相同的键。