nvlist_lookup_double
(void) nvlist_lookup_double(propval,
ret = nvlist_lookup_double(pv->tp_val,
e = nvlist_lookup_double(pfmri, INV_PVAL, &dbl);
if (nvlist_lookup_double(args, TOPO_METH_SES_READING_MULT,
int nvlist_lookup_double(nvlist_t *, const char *, double *);