add CCArray.of_iter

[illusory0x0]

• #471

[illusory0x0]

Looks useful, do you also want to add the updated benchmarks?

should we add more benchmark?

when iter_len very small, use list as buffer is faster than other implementation.

[c-cube]

lists might be faster for small sizes, but what about large sizes? does it get worse?

[illusory0x0]

it would get worse.

look this benchmark for more details