It’s documented in the package description, as this is a packaging
issue, not a bug in the program:

 .
 Note that ACLs and Extended Attributes are not supported.
 Also, on Debian GNU/Hurd and Debian GNU/Linux (but not
 Debian GNU/kFreeBSD), size of archive members is limited
 to the width of the "long" type, that is, 2 GiB on platforms
 that do not have a 64-bit "long" type, due to a bug in the
 GNU C library (Debian #317466).

Other limitations are documented in paxcpio(1):

CAVEATS
     Different file formats have different maximum file sizes.  It is recom‐
     mended that a format such as cpio or ustar be used for larger files.

           File format    Maximum file size
           ar             10 Gigabytes - 1 Byte
           bcpio          4 Gibibytes
           sv4cpio        4 Gibibytes
           cpio           8 Gibibytes
           tar            8 Gibibytes
           ustar          8 Gibibytes

These are inherent to the archive format and cannot be changed at all.

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https://bugs.launchpad.net/bugs/56764

Title:
  Unable to create files larger than 2GB

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