big_snbt.snbt: https://minecraftcommand.science/commands/3982
bigtest.nbt: https://raw.github.com/Dav1dde/nbd/master/test/bigtest.nbt
level.dat: local file generated by a Spigot server
Player-nan-value.dat: https://github.com/VADemon/nbd/raw/5de7a3f37569e1ffee11afbc017ae08e2c24523e/test/Player-nan-value.dat
snbt_edge_cases.snbt: custom made