[bug #62089] find -size -1024k different from -size -1M

Follow-up Comment #2, bug #62089 (project findutils):

I think I know why, in `man find`, it actually gives an example:

```
       -size n[cwbkMG]

...

The + and - prefixes signify greater than and less than, as usual; i.e., an
exact size of n units does not match.  Bear in mind that the size is rounded
up  to  the
              next unit.  Therefore -size -1M is not equivalent to -size
-1048576c.  The former only matches empty files, the latter matches files from
0 to 1,048,575 bytes.

```

So it "only matches empty files"! this behavior is so confusing!

Can we change to let 1M means 1,048,575 bytes? or at least issue a warning:
saying "this flag only matches empty files"!.



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