[LeoPanthera]

In most cases, 128k is actually the optimal block size, and is (microscopically) faster than 1m. And also uses a tiny bit less ram.

[ape4]

Seems like a good default. I was expecting tons of comments telling me that it had to stay at .5 K for various arcane reasons.

[ben_bai]

I can't even imagine the suffering with broken shell scripts if the defaults change.