[alschwalm]

There is a typo under the 'optimal performance' section. "A zero cost _abstractoin_ ought..."

[galonk]

Also at the end it says "not non-zero cost". Assuming the double-negative is a mistake, they should delete either the "not" or the "non-".

[arthurcolle]

There's also a typo if you search for "they want ot write"