Extend-the-end `+` vs. `.01`, `.02`

[johnnydecimal (Johnny Noble)]

FYI this thread spawned a question that deserved its own thread.

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I was going to type this as a reply to this post from @ontologist but that thread is about extend-the-end, and this question is about something entirely different. Here’s the key bit, from the end: On to the question. This is a problem I have – unresolved – with use of the headers that we introduced with Life Admin. I have no problem with them in that context. That is an essentially fixed system. It is designed to be static. We left 2 IDs free under each header just in case, but the intent …