FOSS gamedev and creative worlds

How do I make a node that, when walked over, kills the player and spawns a small crater (like crater radius 2)
Also, is it:
1) sunlight_propagates = true,
2) sunlight_propagates = 'true',
3) sunlight_propagates = "true",

Ideal crater size:

I never did this before, but have a look at the detector block in Mesecons. It checks for players too.
"Spawping" the crater is just minetest.remove_node(pos)