Serialization roundtrip corrupts `URI`

[theogf]

I noticed that URI were breaking after performing a serialization roundtrip.

Here is a MWE:

using URIs
using Serialization

uri = URI(; path = "some/relative/path.pdf", scheme = "file") # URI("file:some/relative/path.pdf")

buf = IOBuffer()
serialize(buf, uri)
seekstart(buf)
uri2 = deserialize(buf)  # "URI("file://@:some/relative/path.pdf?#")

Perhaps the serialization should just go through string conversion and parsing?