... even if it's internal representation is flawed

It would be better to instead say "even if it's internal representation is rounded." Rounding is not a flaw - unless, of course, the rounding was done in an incorrect manner.

... part of arithmetic operations which accumulated rounding errors

Similarly, I would rewrite that as (something like) "part of arithmetic operations which were rounded".

Just to be clear - both "flawed" internal representations and "rounding errors" are very rare in perl. I think both of those phrases should be reserved to apply to cases where rounding has been done incorrectly.
If those errors are encountered in perl-5.30.0 or later then I'd recommend reporting them.

On USE_QUADMATH builds of perl, some sqrt() operations round incorrectly (by one unit of least precision). And, with USE_LONGDOUBLE builds of perl on Windows there's a specific range of values that don't assign correctly.
There's also some BSD and Solaris (and perhaps other) systems around that have some pretty weird rules regarding USE_LONGDOUBLE arithmetic. (I think that they are "flawed", though it might be arguable.)
Offhand, I struggle to recall there being any flawed internal representations or rounding errors on perl-5.30 or later when perl's NV is "double".

Cheers,
Rob

In reply to Re^2: Perl 5 numeric type and simplifications by syphilis
in thread Perl 5 numeric type and simplifications by pango

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