Why is the latest hyperdrive.el tarball so large?

[Joseph Turner]

https://elpa.nongnu.org/nongnu/hyperdrive.html

v0.5.2 tarball is 790 KiB

v0.5.1 tarball is 138 KiB

There's very little difference between the two versions:

git diff v0.5.1..v0.5.2 --stat

returns

 CHANGELOG.org       |  7 +++++++
 doc/hyperdrive.texi |  4 ++--
 hyperdrive-vars.el  |  2 +-
 hyperdrive.el       | 26 +++++++++++++-------------
 4 files changed, 23 insertions(+), 16 deletions(-)

Why is the latest tarball so much larger?

Thank you!

Joseph