Many hostile mobs(such as zombie, creeper, skeleton, slime, ...) and some neutral mobs(spider, enderman, ...) are spawned even if the light level is more than 7. And the bat will also spawn in the sunshine.

What's more, the slime will spawn in the biome which is not swamp and y>40.

Reproduction:

1. Create a new world;
2. You can see many hostile mobs are spawned during the daytime.