Yk assumes all pointers are the same size as a void pointer.

[vext01]

I think this addresses this comment?

I wasn't sure whether to use sizeof(uintptr_t) or sizeof(void *). Are they the same?

(untested btw :) )

[ltratt]

I haven't looked at the latest standard but previously sizeof(void *) and sizeof(uintptr_t) didn't have to be the same. Since we're looking at pointers I'd err on the side of caution, and clarity, and use sizeof(void *).

[vext01]

Fixed in 663d66ea740d, OK to squash?

[ltratt]

Please squash.

[vext01]

Squashed and updated commit message.