guaranteed NV/floating point math reproducability between major releases?

Does P5P guarantee that NV/FP math on Pure Perl level is reproducible 
between major releases? Specifically the last couple precision digits. I 
am thinking of trying a in32 Visual C compiler optimization flag on 
Windows which would keep a little bit more precision in intermediate 
calculations than before but NVs still remain 8 bytes long in memory.

• guaranteed NV/floating point math reproducability between major releases? by bulk88