Questions about branching in Mercurial

[Mark A. Flacy]

On 2007.05.06 11:17, Marcin Kasperski wrote:
> 
> Well, one can reasonably expect that if hi is using non-default   
> branch,  then the changes he makes  do not apply to default branch (I  
> use term 'branch' in general terms,  not those specific to mercurial).  
> According to the description above, it seems mercurial 'branch' is   
> almost alias to 'tag'.
> Hard to say which command should work differently (maybe not 'branch',  
> but 'merge'), but it is  natural to expect that if I create branch (in  
> version control terms),  make and commit some changes,  then revert to  
> the main branch and ask for merge, then all the changes made on branch  
> are put into default.  Even if internally it means just moving  
> 'default' mark to another  changeset without true merge.

So let's say that we have one of these mega-repositories that contains  
150 branches.

That's potentially 150 heads in the repository.

In that case, what do expect to happen when you enter "hg merge"?