<mime-type type="application/x-matroska">
    <_comment>Matroska Media Container</_comment>
    <!-- Common magic across all Matroska varients -->
    <!-- For full detection, we need a custom Detector, see TIKA-1180 -->
    <magic priority="40">
      <match value="0x1A45DFA3" type="string" offset="0" />
    </magic>
  </mime-type>

  <mime-type type="video/x-matroska">

    [CVE-2020-13871](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13871),
    and
    [CVE-2020-15358](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15358).
*   Pins `numpy` to 1.18.5 to prevent ABI breakage when compiling code that uses
    both NumPy and TensorFlow headers.

# Release 1.15.4

## Bug Fixes and Other Changes

pkg syscall (darwin-arm64), const SYS_GETSID ideal-int
pkg syscall (darwin-arm64), const SYS_GETSOCKNAME = 32
pkg syscall (darwin-arm64), const SYS_GETSOCKNAME ideal-int
pkg syscall (darwin-arm64), const SYS_GETSOCKOPT = 118
pkg syscall (darwin-arm64), const SYS_GETSOCKOPT ideal-int
pkg syscall (darwin-arm64), const SYS_GETTID = 286
pkg syscall (darwin-arm64), const SYS_GETTID ideal-int
pkg syscall (darwin-arm64), const SYS_GETTIMEOFDAY = 116

        *   HostPorts are not supported.
*   An IPv6 network mask for pod or cluster cidr network must be /66 or longer. For example: 2001:db1::/66, 2001:dead:beef::/76, 2001:cafe::/118 are supported. 2001:db1::/64 is not supported
*   For details, see [the complete list of merged pull requests for IPv6 support](https://github.com/kubernetes/kubernetes/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Amerged+label%3Aarea%2Fipv6).

### API Priority and Fairness graduates to Beta

Initially introduced in 1.18, Kubernetes 1.20 now enables API Priority and Fairness (APF) by default. This allows `kube-apiserver` to [categorize incoming requests by priority levels](https://docs.k8s.io/concepts/cluster-administration/flow-control/).