context: use changelogrevision Upcoming patches will make the changelogrevision object perform lazy parsing. Let's switch to it. Because we're switching from a tuple to an object, everthing that accesses the internal cached attribute needs to be updated to access via attributes. A nice side-effect is this makes the code easier to read! Surprisingly, this appears to make revsets accessing this data slightly faster (values are before series, p1, this patch): author(mpm) 0.896565 0.929984 0.914234 desc(bug) 0.887169 0.935642 0.921073 date(2015) 0.878797 0.908094 0.891980 extra(rebase_source) 0.865446 0.922624 0.912514 author(mpm) or author(greg) 1.801832 1.902112 1.860402 author(mpm) or desc(bug) 1.812438 1.860977 1.844850 date(2015) or branch(default) 0.968276 1.005824 0.994673 author(mpm) or desc(bug) or date(2015) or extra(rebase_source) 3.656193 3.743381 3.721032