Not sure if there's anything written on the topic, but I guess you can take a look at some of Damian Conway's public code to see it being used. For example: ht

Not sure if there's anything written on the topic, but I guess you can take a look at some of Damian Conway's public code to see it being used. For example: https://metacpan.org/release/DCONWAY/Keyword-Declare-0.001017/source/lib/Keyword/Declare.pm#L18 https://metacpan.org/release/DCONWAY/Keyword-Declare-0.00101...