`pairs` of a `NamedTuple` shows bools as 1/0 even though no type info is shown

Showing booleans as 1/0 should (AFAIU) only be done when there is type context to see that the integer is in fact a bool, but in this case that does not seem to be the case:

```julia
julia> pairs((; mmap=true))
pairs(::NamedTuple) with 1 entry:
  :mmap => 1

julia> typeof(ans)
Base.Pairs{Symbol, Bool, Tuple{Symbol}, @NamedTuple{mmap::Bool}}
```

