Fix dump(io) and xdump(io), add tests #12072
Merged
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This fixes a bug I ran across when trying to debug some issues with output.
dump and xdump were both defined with (x)dump(args...) and (x)dump(io::IO, args...),
so that (x)dump of a single argument of type <: IO would get an error.
Fixed by adding two methods: (x)dump(arg::IO) = xdump((x)dump,STDOUT::IO,arg)