Zcrypto parsed critical nameConstraints as non-critical

[GOODPWDCETCSZ]

Env: Ubuntu x64

Go version: 1.13, 1.15

Reproduce: ./zcertificate seed-16s31-255s21-363s29.pem

Expected result:
The extension nameConstraints is parsed as critical, as OpenSSL and GnuTLS do.

Actual result:

"name_constraints": {
      "critical": false,
      "permitted_names": [
        "www.c.com"
      ],
      "permitted_email_addresses": [
        "[email protected]"
      ],
      "permitted_ip_addresses": [
        {
          "cidr": "219.218.18.18/32",
          "begin": "219.218.18.18",
          "end": "219.218.18.18",
          "mask": "255.255.255.255"
        }
      ],
      "permitted_directory_names": [
        {
          "country": [
            "UN"
          ]
        }
      ],

Attachment

seed-16s31-255s21-363s29.zip