backend:createadmin - user with less than 4 chars

[kszymukowicz]

Bug Report

Current Behavior
While creating backend user with "backend:createadmin" the username must be at least 4 chars. We use person initials in our projects therefore our usernames are "ab", "bt" etc.

Expected behavior/output
If TYPO3 core allows to create users with less than 4 chars then I suppose "backend:createadmin" should also allow it.

TYPO3 Console command executed

typo3cms backend:createadmin ab 10294812987419284614

TYPO3 Console command output

Username must be at least 4 characters.

Environment

• TYPO3 Console version(s): 5.5.0
• TYPO3 version(s): 9.5.5
• Is your TYPO3 installation set up with Composer (Composer Mode): yes
• OS: OSX

[helhum]

The install tool allows to create admin users with 1 char as username.

@kszymukowicz @l00k Can anybody of you create a pull request changing the check so that single char usernames are allowed? Thanks.

[l00k]

Done.
#820

[helhum]

@l00k Thanks!