Time to create Union of types in Julia 1.9.0 vs Julia 1.8.5

General Usage Performance
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4

This is fixed in the upcoming 1.9.1 release already:

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.9.0 (2023-05-28)
 _/ |\__'_|_|_|\__'_|  |  release-1.9/a7348b7aa9d (fork: 342 commits, 199 days)
|__/                   |

julia> types = [:1, :2, :3, :4, :5, :6, :7, :8, :9, :10, :11, :12, :13, :14, :15];

julia> typesunion = Union{[Val{x} for x in types]...};

julia> struct obj{T<:typesunion}
         a::Int64
       end

julia> objtypesunion = Union{[obj{Val{x}} for x in types]...};

julia> @time objvec = objtypesunion[]
  0.017479 seconds (5.71 k allocations: 381.589 KiB, 96.79% compilation time)
Union{obj{Val{1}}, obj{Val{2}}, obj{Val{3}}, obj{Val{4}}, obj{Val{5}}, obj{Val{6}}, obj{Val{7}}, obj{Val{8}}, obj{Val{9}}, obj{Val{10}}, obj{Val{11}}, obj{Val{12}}, obj{Val{13}}, obj{Val{14}}, obj{Val{15}}}[]
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