Unfortunately, this doesn't work:
``` $var(delimiter) = ","; $var(count) = $(hdr(History-Info)[*]{param.count, $var(delimiter)}); ```
``` ERROR: pv [pv_trans.c:2631]: tr_parse_paramlist(): invalid separator in transformation: count, $var(delimiter)} ERROR: <core> [pvapi.c:1629]: tr_lookup(): error parsing [{param.count, $var(delimiter)}] ```