I've noticed that in some cases, coincident constraint on points doesn't work whereas setting distance to 0 does... but only before the first regeneration. This looks like a bug.
The case where I most often encounter this is setting difference extrusion depth. This is actually very tricky to do without overconstraining the sketch if you want to make it using constraints and not just drag and leave it wherever.
I've noticed that in some cases, coincident constraint on points doesn't work whereas setting distance to 0 does... but only before the first regeneration. This looks like a bug.
The case where I most often encounter this is setting difference extrusion depth. This is actually very tricky to do without overconstraining the sketch if you want to make it using constraints and not just drag and leave it wherever.