Not sure how much you want to let this PR expand, but here's a definitely-a-bug that popped up as I was trying out your PR: hoverinfo has the wrong editType:
Plotly.restyle(gd,{hoverinfo:'x+y'})
does not update the displayed hover info for mesh3d. If you follow it with
Plotly.redraw(gd)
or include something else in the restyle though, it does, like
Plotly.restyle(gd,{hoverinfo:'x+text',text:'AAAAAAAH'})

Also it looks like surface doesn't support text as a single string (only as an array) and both surface and scatter3d have the same hoverinfo restyle problem as mesh3d.

@alexcjohnson good catch. Thanks.

I think I fixed them all in 8ae2d0e by overriding the hoverinfo attribute declaration with editType: 'calc'.

8ae2d0e looks great, thanks for the tests 🔒
Do you want to extend surface to support text as a single string now too, so it matches the new mesh3d.text, or leave that in an issue?

Do you want to extend surface to support text as a single string now too

Oops. I pushed too soon. That's in d20bdc1

Nice - slowly getting all these trace types up to par with each other. 💃