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Why small "Uncompressed Size: 2,048" for ssmtp


I am wondering what makes aptitude screen to print:
  Compressed Size: 54.2 k
  Uncompressed Size: 2,048
  Source Package: ssmtp
for ssmtp package.

Uncompressed size is usually bigger than compressed Size.
Am I missing something.

INFO file in the ssmtp deb package has:

 new debian package, version 2.0.
 size 54172 bytes: control archive=17623 bytes.
      58 bytes,     2 lines      conffiles
    1082 bytes,    64 lines   *  config               #!/bin/sh
     940 bytes,    21 lines      control
    2312 bytes,    96 lines   *  postinst             #!/bin/sh
     362 bytes,    26 lines   *  postrm               #!/bin/sh
     367 bytes,    21 lines   *  preinst              #!/bin/sh
   38672 bytes,   317 lines      templates
 Package: ssmtp
 Source: ssmtp (2.64-8)
 Version: 2.64-8+b2
 Architecture: amd64
 Maintainer: Anibal Monsalve Salazar <anibal@xxxxxxxxxx>
 Installed-Size: 2

This 2 is in KB.  iConsistent with aptitude but why so small???

Any idea?