Behaviour of CL_*_PROPERTIES queries with pointer values

On the 2020/08/04 teleconference, we decided that we'd resolve https://github.com/KhronosGroup/OpenCL-Docs/issues/317 by having CL_*_PROPERTIES queries return the values provided by the user as is. We also identified a special case that warranted further discussion: that of pointer property values. Specifically:

1. Are applications required to keep the memory pointed to by pointer values accessible for the lifetime of objects created with a pointer value passed as property? This does not seem desirable.
2. Should implementations return the pointer value that was passed knowing that it may no longer point to valid memory at the time where it is returned?
3. Should implementations make a copy of the memory referenced by pointer property values and replace it with the pointer to the copy they maintain when properties are queried?