Closes
List
The Closes field is used to enter a list of bugs that this package version addresses.
There is no specific format to this field since it is likely specific to your system (i.e. it may be a number, or few letters and a number, etc.)
The human readable information about the closed issues can be found in the Changes field.
This field is optional and is informational only.
Note that when the --build command is used this field is generated from bug information found in your wpkg/changelog file.