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.

experiments/select_crosstalk.R にあるリンク先の crosstalk の例を再現し、plotly.js の 739 行目で参照されている照合ロジックを調べてください。leaflet、DT、plotly が使用するキー表現を比較し、何かを変更する前に、例全体でどの照合動作に一貫性を持たせるべきかを明確にしてください。リンクされたウィジェットが同じキーを確実に選択できれば完了です。