@debug has massive performance impact on Windows

General Usage Performance
6 
julia> @btime my_sum($x)
  35.591 ns (0 allocations: 0 bytes)
506.50792005648816

julia> @btime my_sum_debug($x)
  56.696 ns (0 allocations: 0 bytes)
506.50792005648816

for me on 1.9.3.