dump() not handling RSA keys correctly?

[FGasper]

openssl genrsa 2>/dev/null | perl -MConvert::ASN1 -MMIME::Base64 -MYAML::Syck -e'use bytes; my $k = do{ local $/; <>}; $k =~ s<^-.+?$><>msg; $k = MIME::Base64::decode($k); print Convert::ASN1::asn_dump($k)'
0000 1187: SEQUENCE {
0004    1:   INTEGER = 0
0007  257:   INTEGER = -1
010C    3:   INTEGER = 65537
0111  256:   INTEGER = -1
0215  129:   INTEGER = -1
0299  129:   INTEGER = -1
031D  128:   INTEGER = -1
03A0  128:   INTEGER = -1
0423  129:   INTEGER = -1
04A7     : }

Those -1 values are actually “big integers”.