-minsize 100M is parsed as -minsize 100 without a peep

[GerHobbelt]

See also #133 comment; while I hadn't seen this in either a quick RTFC of your code nor in the manpage or --help output, I did write this, quite thoughtlessly.¹

-minsize 100M

Given my #133 results, it might be nice to either:

1. parse multipliers k, m and g in both lower and upper case as representing $\times 1000$, $\times 10^6$ and $\times 10^9$ respectively (as we're regarding disk storage, so 1000 base instead of 1024), or
2. give a peep (warning or error) about unsupported/unrecognized input cruft around argument values, e.g. error: 100M is not a valid value. Specify number of bytes as a decimal numeric value. Bye!

Thank you 🙏 😄

Footnotes

1. Mattel's Ken is a certifiable genius compared to me & my brain, sometimes. 🤦
   Plus the bastard has abs, where I only got the b_elly and the ass. 🤡 ↩