Identifies the available versions of a package and which are the compatible, latest, and recommended versions.
| all | All available versions of the package. | 
| compatible | Versions of the package compatible with the current version of Unity. | 
| deprecated | Versions of the package that are deprecated. | 
| latest | Latest version of the package. | 
| latestCompatible | Latest version of the package compatible with the current version of Unity. | 
| recommended | A version of the package recommended to use with the current version of Unity. If there is no recommended version, then this property is an empty string. |