Weird sorting of zero between brackets/braces

[sbertault]

Describe the bug
When between square brackets or curly braces (but not parens) zero is ranked after nine instead of before one.

To Reproduce
Steps to reproduce the behavior:

1. Create new scratch file of type plain text
2. type in the following lines :

9
0
1
a[9]
a[0]
a[1]

5. select all
6. String Manipulations > Sort Lines > Case Sensitive + Normal Sort + Natural Order Comparrator > OK
7. the order is now

0
1
9
a[1]
a[9]
a[0]

Environment :
String Manipulation v 9.5.0

IntelliJ IDEA 2022.1.2 (Ultimate Edition)
Build #IU-221.5787.30, built on May 31, 2022
Runtime version: 11.0.15+10-b2043.56 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o

OS : Linux Debian 11
Locale LANG=fr_FR.UTF-8