Conventional method of producing -git packages

Hello, I am pretty new to the AUR, however I have read through the arch wiki and this question is not really referenced there. I have seen some -git packages which update the package on each new commit to master, which is what I thought -git packages should aim to do, however I have seen others which only do it for every 5 or so commits to save time. However I have also seen another method, of just not bumping the package version and have the package clone master and then append the latest git commit to the package name when building it. What is the actual conventional method of producing a -git package for a piece of software? Thank you, Polarian