minetest/minetest — pull request #1818 by paramat (2014-11-09 12:18:41+00:00)
Title: Tune cave noise scales to 6. Fix blobs spflag, now usable. Update conf.example

6 now seems the best match to me from flying underground and attempting to match caves width visually to my build with the original noise code.
Kwolekr spotted my mistake with spflags, dirt/sand/gravel/lava blobs are now optional, enabled by default.