The Base functions `mod(::Unsigned, ::Signed)` and `mod(::Signed, ::Unsigned)` are broken

[KlausC]

In the recent (and probably earlier) version of Julia we obtain the following results, the second of which is wrong.

julia> VERSION
v"1.11.4"

julia> mod(UInt16(15000), Int16(17767))
15000

julia> mod(UInt16(15000), Int16(17768))
-15000

julia> a = Int16(6000); b = UInt16(65000)
0xfde8

julia> mod(a, b)
0x1558

julia> Int(ans)
5464

That is probably unintended result of overflows in base/int.jl:mod

[KlausC]

Code is from anno 2017.