The three of us discussed: There is overall agreement that @INC handling should be improved, but there are still outstanding questions and issues that overlap with build modules, installer tools, and so on. Plan is to publish a partial document so far as a draft PR and get others to comment further. The recent change to improve the accuracy of caller reported line numbers in expressions involving anonymous subroutines ( Pull #24396 ) has caused more BBC fallout than might have been expected.