What is NQuad count and how can I increase it's limit?

Found it on dgraph alpha:
--mutations_nquad_limit uint

What are the implications when I increase this limit to, let’s say: 2000000? Any downsides apart from a suspected higher CPU/RAM/DISK usage?

Edit
Okay, this is weird. I increased the limit to 2000000 and now the error says:
failed because Dgraph execution failed because NQuad count in the request: 2002000, is more that threshold: 2000000

Why is the threshold added to the actual count?! Something is wrong here…