> There is no such procedure in the latest draft if I am not mistaken.

You're right, I had a cached copy and it has been removed:
https://github.com/scheme-requests-for-implementation/srfi-222/commit/adcde4f0d6503391f054f7ef85a255f206af7254#diff-814071a8a0f2897475ddcad8d091e7ae911cdaf5ca23b81116cf97f9d266266dL112