. I find Pharo 1.2 more stable than 1.3 latest...
Me too. But it is not the core which is less stable in 1.3, but the dev tools.
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. Mechanism to autosave a defined package every method commit to a packagename.mcz by default to ease crash recovery, use monticello only when I need to version it as a done base.
This is done. Every thing you change is recored in .changes file. You can open such file with a text editor to recover lost code or you can even open the recover tool to read it and load back what you lost.
. Debugger stepping through has most times an out of step highlighting. Any fix on this..