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

[JeffreySarnoff]

"""
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}
...