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Thanks for raising this question. My answers to your questions:

### What type of tags will we allow? (Should specific tags like [UrlRewrite] be allowed?)

I am not sure what is the best way to deal with this and I am waiting for community feedback.

### How many tags will we allow? (Should we delete any tag that overlaps another tag?)

I would not impose a tag limit. Overlapping is not necessarily bad, because using a more generic (but meaningful, still not agreeing with [formula]) helps with getting answers from those following these generic tags.

### How much should we trim tags on questions? (Should we purge everything that isn't immediately related to the question, even if the topic is about it?)

I tend to use tags that can also be justified by post content. For the particular case of [What gets allocated on the stack and the heap?](What gets allocated on the stack and the heap?) I would agree with [ram] if the post mentioned an interest in how the allocation is done considering the physical memory. **By allowing tags not directly related to the question it becomes harder to set a limit (why not allow [register], [cache-memory] and [rom] besides the existing tags?).**