st_delete_safe is not safe
st_delete_safe causes BUS error with the following code
st_table *tbl = st_init_numtable();
ID k = 1, v = 1;
st_insert(tbl, k, v);
st_delete_safe(tbl, &k, &v, 100);
This is because st_delete_safe does not support packed state of st_table.
Is st_delete_safe an API for extension libraries? i.e. Is this limitation of st_delete_safe intentional?