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I just tried adding :step day to org-agenda-clockreport-parameter-plist,
but then hitting R in the agenda caused a crash, since
org-clocktable-steps expects ts and te to be strings, though in fact
they are Gregorian day numbers.

This patch fixes the problem for me.  It's quite ugly, so I don't expect
it to be committed in its current form :) but I hope it serves as
inspiration for someone to figure out the right way to solve this.