one and zero inconsistency

[rohanmclure]

It appears that calling one on quantity types outputs the one of the backing type. By contrast, zero will output the zero of the quantity, e.g:

julia> Q = typeof(1.0u"m")
Quantity{Float64,𝐋,Unitful.FreeUnits{(m,),𝐋,nothing}}

julia> zero(Q)
0.0 m

julia> one(Q)
1.0

Not sure if I should be using a different method to obtain the unitary element of the type, but I believe these two methods should provide the same type.

[cstjean]

julia> oneunit(Q)
1.0 m

help?> oneunit
search: oneunit DimensionlessQuantity

  oneunit(x::T)
  oneunit(T::Type)

  Returns T(one(x)), where T is either the type of the argument or (if a type
  is passed) the argument. This differs from one for dimensionful quantities:
  one is dimensionless (a multiplicative identity) while oneunit is
  dimensionful (of the same type as x, or of type T).

[cstjean]

It's confusingly named. zero should be called zerounit, but it was decided in julialang that it's not worth changing IIRC.

[rohanmclure]

Thanks! That makes sense.