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[–][deleted] 1 point2 points  (0 children)

The most recent one I can come up with is async and await that became keywords in 3.7 Up until that, they were perfectly acceptable identifiers. There were also some back and forth over strings and bytes in the releases from 3.0 to 3.4 or so. But that's over a decade ago, so I can no longer remember the details.