Improve the OOP ABI

[Siarhei Siamashka]

On Wednesday, 24 January 2024 at 01:18:18 UTC, deadalnix wrote:
> On Tuesday, 23 January 2024 at 22:15:11 UTC, Siarhei Siamashka 
> wrote:
>> On Tuesday, 23 January 2024 at 21:37:42 UTC, Walter Bright 
>> wrote:
>>> On 1/23/2024 3:49 AM, Andrea Fontana wrote:
>>>> So probably you like xxhash128
>>>> 
>>>> https://xxhash.com/
>>>
>>> Thanks! I do, it has a 64 bit version, does anyone know what 
>>> the collision rate is?
>>
>> If you really need a 64-bit version, then you can simply take 
>> the first 64 bits of MD5. Assuming no defects in a 64-bit hash 
>> implementation, the collision probability is `1.0 / 2^^64` for 
>> a pair of hashed strings. And it becomes a 
>> https://en.wikipedia.org/wiki/Birthday_problem if the number 
>> of hashed strings is larger. There's no magic algorithmic 
>> sauce that can make a small hash collision resistant. A quote 
>> from the Wikipedia article:
>>
>
> While it is not possible to do better than this, it is 
> certainly possible - and in fact way easier than you'd expect - 
> to do worse.

Go ahead and show me truncated output of any hash, designed to be 
cryptographically secure, behaving badly. I know that xxhash, 
ahash, fnv or any other non-secure hashes are prone to have 
collision issues, as they are primarily optimized for speed while 
being borderline acceptable from the collision standpoint.