Christoph Otto via RT wrote:
If there isn't a technical reason why this is necessary, there's no reason to create such a limitation. If there is such a reason, just pick something big and make the code enforce it. The PDD should of course be kept in sync with reality, but that simply entails a simple edit/commit once the issue is settled.
There is currently no need to limit the length of identifiers. Keep the note about possible future limits, because we may someday need a limit. (And because it's useful to document that there is currently no limit.)
Allison