In .info files, "core=" values are overridden by packaging scripts

In my Hierarchical Select module, some submodules have not yet been ported to Drupal 7. Hence, I've explicitly disabled them, by stating that in hierarchical_select/modules/hs_menu.info (as well as in another submodule).

In git, HS 7.x-3.x:

name = Hierarchical Select Menu
description = Use Hierarchical Select for menu parent selection.
dependencies[] = hierarchical_select
dependencies[] = menu
package = Form Elements
core = 6.x

In the tarball:

name = Hierarchical Select Menu
description = Use Hierarchical Select for menu parent selection.
dependencies[] = hierarchical_select
dependencies[] = menu
package = Form Elements
core = 6.x

; Information added by drupal.org packaging script on 2011-07-11
version = "7.x-3.0-alpha2"
core = "7.x"
project = "hierarchical_select"
datestamp = "1310423216"

Hence, d.o's packaging scripts are to blame for the ability to enable the module.

The solution is simple: if a core = something line is detected in a .info file, don't override it.