What does this package status number mean?

I was working on a pull DP issue (the dreaded invalid package status log entry) and needed a list of the possible package status values.  Here you go:

0 PKG_STATUS_NONE 

1 PKG_STATUS_SENT 

2 PKG_STATUS_RECEIVED 

3 PKG_STATUS_INSTALLED 

4 PKG_STATUS_RETRY 

5 PKG_STATUS_FAILED 

6 PKG_STATUS_REMOVED 

7 PKG_STATUS_PENDING_REMOVE -possibly not used

8 PKG_STATUS_REMOVE_FAILED 

9 PKG_STATUS_RETRY_REMOVE