It is currently impossible to say that you don't want an overflow
message if those warnings are enabled.
#define PERL_SCAN_ALLOW_UNDERSCORES 0x01 /* grok_??? accept _ in numbers */
#define PERL_SCAN_DISALLOW_PREFIX 0x02 /* grok_??? reject 0x in hex etc */
-/* grok_??? input: don't warn on overflowing a UV; output: found overflow */
+/* grok_??? input: ignored; output: found overflow */
#define PERL_SCAN_GREATER_THAN_UV_MAX 0x04
/* grok_??? don't warn about illegal digits. To preserve total backcompat,