The manual (current git) says:
True if the time of the last access (or status change or data modification)
> of the current file is more recent than that of the last data modification
> of the @var{reference} file.
>
Presumably it really means:
True if the time of the last access (or status change or data modification)
of the current file is more recent than that of the @var{reference} file.
In other words, like is compared with like, it's not always the mtime of
the reference file that is used.
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