PR
#4783 is now in Leo's "devel" branch.
This is an emergency fix that undoes huge blunders in a previous PR. The event kwarg must default to None almost everywhere. My apologies for this screw-up.
The PR also probably fixes
#4784 and temporarily works around
#4778 by disabling
g.is_binary_string.
PR #4783 is a big step in the right direction, but more work may be needed. Please keep testing!
Edward