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Not a priority for M1.

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cc @sgjesse.
Added Library-Core label.

File URIs are special in that their format requires the // of the authority, even if the authority is empty (RFC 1738). That is why we explicitly add the "//" in the toString, even with no authority.

I'll add handling of paths starting with "//" and no authority. These need the "//" even if they are not file paths.

Added AsDesigned label.

We also do things like:

Uri.parse('org-dartlang-foo:///fisk.txt').toString() -> 'org-dartlang-foo:/fisk.txt'.

Set owner to @lrhn.
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Are the issues fixed now?

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