$FUNCNAME alternative in /bin/sh

Question

Does the POSIX shell have something similar to $FUNCNAME in bash ?

Answer 1

No. The list of variables which are required to have special behavior by the POSIX sh standard is quite small, and no equivalent to FUNCNAME is given; the closest thing is LINENO.

(If such a thing already existed in POSIX sh, why would bash have added its own rather than implementing the specification?)