Ah, it seems Sigil on a mac can create an .zip (.epub) with Unicode Normalization Form D that will not be in sync with manifest urls that are Unicode Normalization Form C (and visa versa).
So at the boundary Sigil will have to convert zip files names and all files to be Unicode Normalized to form C.
The worst is that macOS HFS+ file systems forced a modified Form D on all paths and filenames but its new APFS filesystem does not meaning that mixed normalization file names and paths can both exist on a mac with the newer APFS filesystem.
Just what I needed.
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