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PB5 5V-intolerant on F1xx?

Question asked by mvduin on Jul 22, 2014
I noticed that, ignoring supply pins, every pin on an STM32F1xx device is 5V-tolerant except:
  • special-purpose inputs nRST and BOOT0
  • backup-domain pins: PC13-15
  • pins with analog (ADC/DAC/oscillator) functionality on at least one F1xx device: PA0-7, PB0-1, PC0-5, PF6-10
  • and finally... PB5.
So what's up with PB5 ?  As far as I can tell from the documentation it is a wholly unremarkable digital I/O pin.  Is there some non-obvious reason it isn't 5V-tolerant?