Sure, I think it's intuitive why lc('Boaty McBoat') is conceptually a "lossy" transformation (in terms of being able to restore the original string).

But NFKC("\N{VULGAR FRACTION THREE EIGHTHS}") is conceptually "lossless": there is only one Unicode character the resultant string "3\N{FRACTION SLASH}8" could be "composed" into.

As I wrote, I get now why NFKC is conceptually lossy in general. But—unlike with lc—some specific decompositions are exceptions.

In reply to Re^3: Unicode vulgar fraction composition by raygun
in thread Unicode vulgar fraction composition by raygun

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