This variable indicates how many of bits type uvtype
a variable nvtype can preserve.
+nv_overflows_integers_at (perlxv.U):
+ This variable gives the largest integer value that NVs can hold
+ as a constant floating point expression.
+ If it could not be determined, it holds the value 0.
+
nveformat (perlxvf.U):
This variable contains the format string used for printing
a Perl NV using %e-ish floating point format.