Hi! Could the mod set "raise_event=true" on "surface.set_tiles(tileArray)" to announce the tile change? (if player placed tiles it can already be captured by events but canal builder omits that)

Additional idea that I'd appreciate for my mod as an event receiver: pass old tile name in tileArray data as in
(this thread claims its possible: "If you are raising the event using script.raise_script_set_tiles inside of the table next to the mandatory fields you may pass additional fields that will be delivered to the event receiver."
https://forums.factorio.com/viewtopic.php?t=90456):

local current_position = {pos.x + x, pos.y}
local old_tile = surface.get_tile(current_position.x , current_position.y)
tileArray[i] = {
name = replacement,
position = current_position ,
old_name=old_tile.name
}

(would need to test it to be 100% it works correctly as the thread mentioned)
I can prepare an example PR and test it if you're open to implementing these ideas.