one of these is not like the other (signature, arg and args)


"""
  findfirstsortedequal(**__vars__**::DenseVector{Int64}, **_var_**::Int64)::Union{Int64,Nothing}

Note that this differs from `searchsortedfirst` by returning `nothing` when absent.
"""
```
function findfirstsortedequal(
    var::Int64,
    vars::DenseVector{Int64},
    ::Val{basecase} = Base.libllvm_version >= v"17" ? Val(8) : Val(128),
) where {basecase}
...
```