Unexpected setNodeMarkup / setNodeAttribute difference

1

I figure these two should be the same:

tr.setNodeMarkup(pos, undefined, {...tr.doc.nodeAt(pos).attrs, [name]: value})
tr.setNodeAttribute(pos, name, value)

But the second one is causing a test failure. What’s the difference?

I’ve tried outputting the attrs after the line in question to debug, and the same JSON is output either way.

2

setNodeMarkup replaces the node’s opening token, whereas setNodeAttribute has an empty step map. Position mapping will be different for them.