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This is a basic constraints extension, where the critical field (BOOLEAN) is 3.
This is not valid because BOOLEANs in DER-encoding should use an octet of
either all 0 bits or all 1 bits.
$ openssl asn1parse -i < [EXTENSION]
0:d=0 hl=2 l= 12 cons: SEQUENCE
2:d=1 hl=2 l= 3 prim: OBJECT :X509v3 Basic Constraints
7:d=1 hl=2 l= 1 prim: BOOLEAN :3
10:d=1 hl=2 l= 2 prim: OCTET STRING [HEX DUMP]:3000
-----BEGIN EXTENSION-----
MAwGA1UdEwEBAwQCMAA=
-----END EXTENSION-----
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