Starting with which version of Delphi is UInt64 not just available but also actually unsigned?

Question

Several questions and answers (e.g. here and here) mention that in Delphi 7 the type UInt64 exists, but contrary to what the name suggests it is a signed 64-bit integer.

What is the minimum version of Delphi that supports actual properly unsigned 64-bit integers natively?

Answer 1

A true unsigned UInt64 type was first supported in Delphi 2007.

QC#1210

Answer 2

As it is stated in documentation:

Pre XE4

type UInt64 = Int64;

XE4

type UInt64 = { built-in type };