@debug has massive performance impact on Windows

General Usage Performance
18

The difference is that on Windows, accessing the environment seems to allocate:

julia> f() = get(ENV, "JULIA_DEBUG", "")
f (generic function with 1 method)

julia> @btime f(); # Linux
  26.734 ns (0 allocations: 0 bytes)

julia> @btime f(); # Windows
  112.293 ns (2 allocations: 112 bytes)
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