pullbundle: deal with head in a predicable order We use node order to make this repeatable from one clone to another. This is an arbitrary pick.

pullbundle: deal with another special case introduced by arbitrary ranges previous, we dealt with the case where the tippest subrange of the stable parent was too long. Now, we need to deal with the case where it is too small.

pullbundle: compat with Mercurial 4.7

pullbundle: add some information on the cached change This also adds a way to skip "caching" smaller range in the debugcommand (not in the extensions itself).

pullbundle: add data about the cached bundle size and hit

pullbundle: add a command to generate cache hit statistic This new command should help checking that the stable range produce reusable bundle.

pullbundle: point out the output flooding issue from core Right now, we don't have a reliable progress report when using pullbundle.

pullbundle: issue local branches in the right order

pullbundle: delay cache file opening Otherwise we can end-up with a too many file open at the same time.

pullbundle: improve slicing of the lower part of range The previous method could get confuse by merge and overslice. The new method is better at using sticking on power of two boundaries.