bn.top=1. B<neg> is 1 if the number is negative. When a B<BIGNUM> is
B<0>, the B<d> field can be B<NULL> and B<top> == B<0>.
-B<flags> is a bit field of flags which are defined in C<openssl/bn.h>. The
-flags begin with B<BN_FLG_>. The macros BN_set_flags(b,n) and
+B<flags> is a bit field of flags which are defined in C<openssl/bn.h>. The
+flags begin with B<BN_FLG_>. The macros BN_set_flags(b,n) and
BN_get_flags(b,n) exist to enable or fetch flag(s) B<n> from B<BIGNUM>
structure B<b>.