I have set coloumns "~multi" and "~txt" as dataType "stringi", but the dataType being sent to server in pq_filter is "string" (see below).
Column "~sel" is dataType "string" and sends "string" correctly.
{
"mode":"AND",
"data":[
{"dataIndx":"~multi","dataType":"string","value":["opt2","opt3","opt4"],"condition":"range"}, // Not "stringi"
{"dataIndx":"~sel","dataType":"string","value":"op2","condition":"equal"},
{"dataIndx":"~txt","dataType":"string","value":"rrr","condition":"contain"} // Not "stringi"
]
}