buf() mishandles [3, 0, 0, 0, 0]

[FGasper]

> const CRC32_MOD = require('crc-32');
undefined
> CRC32_MOD.buf([3, 0, 0, 0, 0])
-2122150451
>

[FGasper]

Never mind … I didn’t realize this computes a signed value rather than unsigned.

[reviewher]

"The return value is a signed 32-bit integer."

See the discussion from an older issue. Basically V8 has a special optimization for 32-bit signed integers which is generally awesome but performs extremely poorly for naive CRC calculations

[FGasper]

Might be nice to include a convenience that does the signed-to-unsigned conversion?

I think it's just: 0xffffffff - ~signed?

[reviewher]

Even easier: signed >>> 0 :) kinda seems like a waste to add that as a convenience method, but it's probably worth adding that to the README (PRs welcome)