Use std prefix also for abs of integer value

Change-Id: I5d5940b6196309f8d14452eb5caefcd92f24def4
fix: use argument in tests instead of arbitrary string

Change-Id: Id3830f88a853cb723f7483eb5125a33d4947a09e
Make vsprintf return number of characters written

Change-Id: I3776f8ae13e402930425670c0ed136b4a95ca9b0
Fix Array constructor from native array

Change-Id: Ic514c5d435e661bf29b1ad1110379fee18de680f