Need a Faster Compressor

[Era Scarecrow via Digitalmars-d]

On Sunday, 22 May 2016 at 18:04:25 UTC, Rainer Schuetze wrote:
> On 22.05.2016 19:56, Era Scarecrow wrote:
>>  Unless ? is the proper/valid character those are far more 
>> likely to be failed UTF-8 decoding. Care to double check?
>
> ? is an allowed character in VC++ and for example permits 
> unambiguous demangling. The gcc style using only alpha numeric 
> characters and '_' can also just be plain C symbols.

  Not quite what I asked. Is the sample provided accurate? Is 
having 3 ?s in a row what should be there not just spitting a ? 
because it doesn't know how to decode it?