I just updated my local environment to PHP 8.1 and checked that there are several issues:

Deprecated: preg_match(): Passing null to parameter #4 ($flags) of type int is deprecated in /lessphp/lessc.inc.php on line 3608
Deprecated: Implicit conversion from float 19789.30078125 to int loses precision in /lessphp/lessc.inc.php on line 1672

Any plans on updating the existing code to support 8.1? Is there anybody who already forked the current code and updated it?