a fraction, with a decimal point before it. I.e., `-M5` becomes
0.5, and is thus the same as `-M50%`. Similarly, `-M05` is
the same as `-M5%`. To limit detection to exact renames, use
- `-M100%`.
+ `-M100%`. The default similarity index is 50%.
-C[<n>]::
--find-copies[=<n>]::