Since #10040 (9.2.5 and after) this happens with the i2ctarget example:

code starting...
9.789: INFO - read request to address '0x40'
Traceback (most recent call last):
  File "code.py", line 38, in <module>
AttributeError: 'I2CTargetRequest' object has no attribute 'deinit'

This is apparently because the new default __exit__ requires the presence of deinit in the object's dictionary, and I2CTargetRequest doesn't have one. It has a close() though, (which incidentally doesn't have a docstring).

Should I2CTargetRequest have a deinit() that calls common_hal_i2ctarget_i2c_target_close() and also maybe remove the close() method ?