We use the memory address to detect reference to ''the same language object.''
While primarily a testing tool, this predicate is also used in the
core application at places, especially to prevent self-assignment
and to handle custom allocations.
It turns out that actually we need two flavours for convenient usage
- `isSameObject` uses strict comparison of address and accepts only references
- `isSameAdr` can also accept pointers and even void*, but will dereference pointers
This leads to some further improvements of helper utilities related to memory addresses...
