[racket] Pkg install error

Hi,

(using this morning's racket build)
I've just uploaded a package to pkg, but when I try to install it for
testing I get the following error:

% raco pkg install script-plugin
Resolving "script-plugin" via https://pkg.racket-lang.org
Downloading https://github.com/Metaxal/script-plugin/tarball/
=: contract violation
  expected: number?
  given: #<eof>
  argument position: 1st
  other arguments...:
   31

However, when I install it directly from github, with the exact same
source, it works:

% raco pkg install github://github.com/Metaxal/script-plugin/v2.18/
Querying GitHub branches
Querying GitHub tags
Downloading
https://github.com/Metaxal/script-plugin/tarball/d1691f01bbe3b72f4b79aef40b6a3db9f0ce061e
raco setup: version: 5.90.0.9 [3m]
[...]

Am I doing something wrong?

Laurent
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