Struct with Parameters.jl and outer function

General Usage
2

The following example

using Unitful
using Parameters

@with_kw struct Grid
    nx::Int
    Lx::Float64
    Δx::Float64 = Lx / (nx-1)
    x::StepRangeLen = range(0, length=nx, stop= Lx)
end

# convert Length unit
function Grid(nx::Int, Lx::Unitful.Length)
    Grid(;nx=nx, Lx=ustrip(u"m", Lx))
end

@show Grid(101, 1000u"m")
@show Grid(101, 1000u"1000")

yields

Grid(101, 1000 * u"m") = Grid
  nx: Int64 101
  Lx: Float64 1000.0
  Δx: Float64 10.0
  x: StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}

ERROR: MethodError: no method matching Grid(::Int64, ::Int64)

which seems sensible to me. Your first example seems to break units, because you manage to construct a Grid from a non-length unit?