In 5.10, split in scalar context still split to @, which was removed in 5.12, this affects, at least, Raisin/Middleware/Formatter.pm@65, which throws the deprecation warning when run on 5.10/5.10.1
Use of implicit split to @ is deprecated at /lib/perl5/Raisin/Middleware/Formatter.pm line 65.
In 5.10, split in scalar context still split to @, which was removed in 5.12, this affects, at least, Raisin/Middleware/Formatter.pm@65, which throws the deprecation warning when run on 5.10/5.10.1 Use of implicit split to @ is deprecated at /lib/perl5/Raisin/Middleware/Formatter.pm line 65.