Be explicit that aliases are not part of X.509 certificates

    /// Returns this certificate's "alias". This field is populated by

    /// OpenSSL in some situations -- specifically OpenSSL will store a

    /// PKCS#12 `friendlyName` in this field.

    /// PKCS#12 `friendlyName` in this field. This is not a part of the X.509

    /// certificate itself, OpenSSL merely attaches it to this structure in

    /// memory.

    #[corresponds(X509_alias_get0)]

    pub fn alias(&self) -> Option<&[u8]> {

        unsafe {