What is the syntax equivalent of RESOLV::lookup with the RESOLVER::name_lookup command?

I wrote a gist to cover this, but also, a peer of mine, Paul, has a more complete solution in BUG 931149 (make sure you have a working net resolver in tmsh):

proc resolv_ptr_v4 { addr_v4 } {
    # Convert $addr_v4 into its constituent bytes
    set ret [scan $addr_v4 {%d.%d.%d.%d} a b c d]
    if { $ret != 4 } {
        return
    }
 
    # Perform a PTR lookup on the IP address $addr_v4, and return the first answer
    set ret [RESOLVER::name_lookup "/Common/resolver-for-irules" "$d.$c.$b.$a.in-addr.arpa" PTR]
    set ret [lindex [DNSMSG::section $ret answer] 0]
    if { $ret eq "" } {
        # log local0.warn "DNS PTR lookup for $addr_v4 failed."
        return
    }
 
    # Last element in '1.1.1.10.in-addr.arpa.  600    IN      PTR     otters.example.com'
    return [lindex $ret end]
}
 
-- In an iRule, instead of:
    RESOLV::lookup @192.88.9.1 $ipv4_addr
Use:
    call resolv_ptr_v4 $ipv4_addr

For consistency across all record types, I'm going to flesh out that proc in the next few days so you can use the proc to pass the query and the query type so you don't have to have different logic in your main iRule just for PTR records.