Help reducing compilation time

I reduced the problem to this line!

        write(line_buf, line)

If I change it to:

        write(line_buf, string(line))

Everything is MUCH faster. I just cannot tell why this is happening.

I solved by adding the following to the package:

        let
            io = IOBuffer()
            write(io, SubString("test", 1, 4))
        end
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