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

URL:
  <https://savannah.gnu.org/bugs/?62089>

                 Summary: find -size -1024k  different from -size -1M
                 Project: findutils
            Submitted by: None
            Submitted on: Mon 21 Feb 2022 02:12:06 AM UTC
                Category: find
                Severity: 3 - Normal
              Item Group: Wrong result
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 4.7.0
         Discussion Lock: Any
           Fixed Release: None

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Details:

I'm trying to count the image files by size, here is what I got:

find -size -1024k  different from -size -1M

```
$ find data/images/ -type f -name '*.jpg' | wc
 878161  878161 27220516  # total number of jpg files

$ find data/images/ -type f -name '*.jpg'  -size -500k | wc
 878065  878065 27217540  # number of files whose size < 500k

$ find data/images/ -type f -name '*.jpg'  -size -1M | wc
    356     356   11036   # number of files whose size < 1M
```

So how come it's only 356 (much less than 878065)? 

Anyone can explain? or tell me what's going wrong?


Then I tried `-1024k`, instead of `-1M`, which returns reasonable number:
```
$ find data/images/ -type f -name '*.jpg'  -size -1024k | wc
 878119  878119 27219214
```

So, why `-1M` behaved so wrong?


Below is my machine's system info:

```
$ which find
/usr/bin/find

$ dpkg -S /usr/bin/find
findutils: /usr/bin/find

$ dpkg -l findutils
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                    Version                 
Architecture             Description
+++-=======================================-========================-========================-====================================================================================
ii  findutils                               4.6.0+git+20170828-2     amd64    
               utilities for finding files--find, xargs


$ find --version
find (GNU findutils) 4.7.0-git
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Eric B. Decker, James Youngman, and Kevin Dalley.
Features enabled: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION FTS(FTS_CWDFD)
CBO(level=2) 


$ cat /etc/issue.net 
Ubuntu 18.04.2 LTS

$ uname -a
Linux 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64
x86_64 x86_64 GNU/Linux
```




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