**Note:**`ISOTime` is used for fields that only support year-month-day formatting, while `*time.Time` is used for full timestamps.
## API Update for PackageProtectionRule
The variable type for `MinimumAccessLevelForDelete` and `MinimumAccessLevelForPush` were previously `int64`, and have been changed to a `string` to align with the documentation. In addition, they use a new `Nullable[string]` type that allows explicit `null` values to be sent to the API, since `null` is a valid and intentional value for this API call.
**Changes:**
- Parameter type: Changed from `*int64` to `Nullable[ProtectionRuleAccessLevel]` ( string, nullable )