Can't use smooth() with ::Date axis

[non-Jedi]

Bug description

MethodError is thrown when trying to use smooth() with a ::Date column mapped to an axis. Seem like I get to be the guinea pig to find the bugs in Dates interop :) (thanks for fixing #369 @piever!). I did ]dev AoG to make sure that #373 didn't fix this somehow.

Steps to reproduce

using AlgebraOfGraphics, CairoMakie, Dates

df = (x=[1, 2, 3],
      y=collect(Date(2022,1,1):Day(1):Date(2022,1,3)))
draw(data(df) * mapping(:y, :x) * smooth())

Error reporting

ERROR: MethodError: no method matching float(::Type{Any})
Closest candidates are:
  float(::Type{Union{Missing, T}}) where T at /opt/julia-1.7.2/share/julia/base/missing.jl:112
  float(::Any) at /opt/julia-1.7.2/share/julia/base/float.jl:269
  float(::Union{StatsBase.PValue, StatsBase.TestStat}) at ~/.julia/packages/StatsBase/pJqvO/src/statmodels.jl:86
  ...
Stacktrace:
  [1] float(#unused#::Type{Any})
    @ Base ./missing.jl:113
  [2] loess(xs::Vector{Date}, ys::Vector{Int64}; kwargs::Base.Pairs{Symbol, Real, Tuple{Symbol, Symbol}, NamedTuple{(:span, :degree), Tuple{Float64, Int64}}})
    @ Loess ~/.julia/packages/Loess/dv7Ad/src/Loess.jl:120
  [3] (::AlgebraOfGraphics.var"#176#177"{AlgebraOfGraphics.SmoothAnalysis})(p::Vector{Vector}, #unused#::Dictionaries.Dictionary{Symbol, Any})
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/transformations/smooth.jl:10
  [4] (::AlgebraOfGraphics.var"#78#79"{AlgebraOfGraphics.var"#176#177"{AlgebraOfGraphics.SmoothAnalysis}, ProcessedLayer})(c::CartesianIndex{1})
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/algebra/layer.jl:85
  [5] iterate
    @ ./generator.jl:47 [inlined]
  [6] _collect(c::CartesianIndices{1, Tuple{Base.OneTo{Int64}}}, itr::Base.Generator{CartesianIndices{1, Tuple{Base.OneTo{Int64}}}, AlgebraOfGraphics.var"#78#79"{AlgebraOfGraphics.var"#176#177"{AlgebraOfGraphics.SmoothAnalysis}, ProcessedLayer}}, #unused#::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:744
  [7] collect_similar(cont::CartesianIndices{1, Tuple{Base.OneTo{Int64}}}, itr::Base.Generator{CartesianIndices{1, Tuple{Base.OneTo{Int64}}}, AlgebraOfGraphics.var"#78#79"{AlgebraOfGraphics.var"#176#177"{AlgebraOfGraphics.SmoothAnalysis}, ProcessedLayer}})
    @ Base ./array.jl:653
  [8] map(f::Function, A::CartesianIndices{1, Tuple{Base.OneTo{Int64}}})
    @ Base ./abstractarray.jl:2849
  [9] map(f::AlgebraOfGraphics.var"#176#177"{AlgebraOfGraphics.SmoothAnalysis}, processedlayer::ProcessedLayer)
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/algebra/layer.jl:84
 [10] (::AlgebraOfGraphics.SmoothAnalysis)(input::ProcessedLayer)
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/transformations/smooth.jl:8
 [11] ProcessedLayer(layer::Layer)
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/algebra/layer.jl:64
 [12] iterate
    @ ./generator.jl:47 [inlined]
 [13] collect(itr::Base.Generator{AlgebraOfGraphics.Layers, Type{ProcessedLayer}})
    @ Base ./array.jl:724
 [14] map
    @ ./abstractarray.jl:2878 [inlined]
 [15] compute_axes_grid(s::Layer; axis::NamedTuple{(), Tuple{}}, palettes::NamedTuple{(), Tuple{}})
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/algebra/layers.jl:97
 [16] compute_axes_grid(fig::Figure, s::Layer; axis::NamedTuple{(), Tuple{}}, palettes::NamedTuple{(), Tuple{}})
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/algebra/layers.jl:84
 [17] #233
    @ ~/repos/AlgebraOfGraphics.jl/src/draw.jl:21 [inlined]
 [18] update
    @ ~/repos/AlgebraOfGraphics.jl/src/draw.jl:10 [inlined]
 [19] plot!(fig::Figure, s::Layer; axis::NamedTuple{(), Tuple{}}, palettes::NamedTuple{(), Tuple{}})
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/draw.jl:21
 [20] (::AlgebraOfGraphics.var"#237#238"{NamedTuple{(), Tuple{}}, NamedTuple{(), Tuple{}}, NamedTuple{(), Tuple{}}, NamedTuple{(), Tuple{}}, NamedTuple{(), Tuple{}}, Layer})(f::Figure)
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/draw.jl:46
 [21] update
    @ ~/repos/AlgebraOfGraphics.jl/src/draw.jl:10 [inlined]
 [22] #draw#236
    @ ~/repos/AlgebraOfGraphics.jl/src/draw.jl:45 [inlined]
 [23] draw(s::Layer)
    @ AlgebraOfGraphics ~/repos/AlgebraOfGraphics.jl/src/draw.jl:45
 [24] top-level scope
    @ REPL[9]:1

Version info

julia> versioninfo()
Julia Version 1.7.2
Commit bf53498635 (2022-02-06 15:21 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-10810U CPU @ 1.10GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, skylake)

julia> using Pkg; Pkg.status()
      Status `/tmp/jl_KnDH6U/Project.toml`
  [cbdf2221] AlgebraOfGraphics v0.6.5 `../../home/adam/repos/AlgebraOfGraphics.jl`
  [13f3f980] CairoMakie v0.7.5

[non-Jedi]

Can workaround by manually using AlgebraOfGraphics.datetime2float in the mapping and using axis=(xticks=AlgebraOfGraphics.ticks(extrema(df.date)),).

[non-Jedi]

This is an issue with LOESS which currently only accepts Float64. There's an open PR to fix this, but it only widens the accepted type to AbstractFloat. I might take a shot at making it truly generic, but I'm not sure off the top of my head if there's anything about the Loess algorithm that requires x and y to have the same dimensionality, so it may not be possible.