Feature Request: Disallow mob spawning on obsidian.

[smokinchili]

In the purpur.yml configuration file I can see that it is possible to disallow mob spawning on blue ice and packed ice. I was simply wondering this functionality can be extended to obsidian as well. I tried to add a new line for obsidian with "allow-mob-spawns" set to false and it does not work.

The reason I am asking this is because many people who play on our private server are very inspired by 2b2t's nether highways, and we are building our own. Unfortunately the amount of mob spawning on the highway is overwhelming. Hoglins and also magma cubes also spawn in any light level, so light sources are not helping.

This feature would also have the added benefit of allowing users to have a functional nether base, assuming they can afford to use obsidian for the entire floor.