Bug #17400
Updated by xfalcox (Rafael Silva) over 3 years ago
An issue caused by this bug was first reported at Discourse support community at https://meta.discourse.org/t/unicode-username-results-in-error-loading-profile-page/173182?u=falco.
The issue is that in Greek, there are two ways to downcase the letter ‘Σ’
- ‘ς’ when it is used at the end of a word
- ‘σ’ anywhere else
NodeJS follows this rule:
```
➜ node
Welcome to Node.js v12.11.1.
Type ".help" for more information.
> "ΣΠΥΡΟΣ".toLowerCase()
'σπυρος'
```
Python too:
```
➜ python
Python 3.8.2 (default, Nov 23 2020, 16:33:30)
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> "ΣΠΥΡΟΣ".lower()
'σπυρος'
```
Ruby (both 2.7 and 3) doesn't:
```
➜ ruby --version
ruby 3.0.0dev (2020-12-16T18:46:44Z master 93ba3ac036) [x86_64-linux]
➜ irb
irb(main):001:0> "ΣΠΥΡΟΣ".downcase
=> "σπυροσ"
```
```
➜ ruby --version
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
➜ irb
irb(main):001:0> "ΣΠΥΡΟΣ".downcase
=> "σπυροσ"
```