fix axis keyword

src/args.jl

@@ -945,7 +945,7 @@ function RecipesPipeline.preprocess_attributes!(plotattributes::AKW)
     replaceAliases!(plotattributes, _keyAliases)
 
     # handle axis args common to all axis
-    args = RecipesPipeline.pop_kw!(plotattributes, :axis, ())
+    args = wraptuple(RecipesPipeline.pop_kw!(plotattributes, :axis, ()))
     showarg = wraptuple(RecipesPipeline.pop_kw!(plotattributes, :showaxis, ()))
     for arg in wraptuple((args..., showarg...))
         for letter in (:x, :y, :z)

test/test_axes.jl

@@ -1,6 +1,14 @@
 using Plots, Test
 
 @testset "Showaxis" begin
+    for value in Plots._allShowaxisArgs
+        @test plot(1:5, showaxis = value)[1][:yaxis][:showaxis] isa Bool
+    end
     @test plot(1:5, showaxis = :y)[1][:yaxis][:showaxis] == true
     @test plot(1:5, showaxis = :y)[1][:xaxis][:showaxis] == false
 end
+
+@testset "Magic axis" begin
+    @test plot(1, axis=nothing)[1][:xaxis][:ticks] == []
+    @test plot(1, axis=nothing)[1][:yaxis][:ticks] == []
+end # testset