Assembling a scheme-bearing form always writes '://' after the scheme, even
if the input has no authority part. For a schemeless relative path such as
'../../local/path', .full then becomes 'file://../../local/path', which
re-parses with '..' as the host and '/../local/path' as the path, both
entirely broken.
Fix __assemble() to write a bare ':' instead of '://' when the input has no
host and a relative path, so the assembled form re-parses back to the same
relative path: full of '../../local/path' is now 'file:../../local/path'.
Absolute paths and forms with an authority are unchanged.
The assembled 'file:../../local/path' form is a valid URI under the RFC
3986 generic grammar (scheme with a rootless path), while RFC 8089's file
URI ABNF admits only an empty or an absolute path. Uri thus trades RFC 8089
conformance for RFC 3986 compatibility: a relative path survives the
full-and-reparse cycle unchanged.
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>
Jan Lindemann
a1ae17c8cb