version check in GUtil synopsis is wrong
The synopsis shown in GUtils.xs includes:
# require at least version 1.021 of the Glib module
use Glib '1.021';
Quoting the version number on a use line is not really correct. It will cause the version number to be treated as an import argument rather than a version number. Sometimes, if the module is using Exporter, this will still check the version. For other modules, it will just be ignored, or will trigger an error. Even for modules using Exporter, this isn't a good thing to rely on.
Instead, the code should be:
# require at least version 1.021 of the Glib module
use Glib 1.021;