Commits on Jun 7, 2019
Changed code for multi-release compatibility.
Instead of `Short.valueOf(value).toString()` we can implement `UByte#toString()` as `Short.toString(value)`. Also `UByte#hashCode()` can be changed from `Short.valueOf(value).hashCode()` to `Short.hashCode(value)` as of Java 1.8. Same changes for `UInteger` and `UShort` and also to `ULong` for the `hashCode()` implementation.