BASH functions with multiple results

BASH functions are limited...
Check Bash-Prog-Intro-HOWTO

... but sometimes it is required to have BASH functions that returns multiple results.
In case of strings or numbers next idea could be applied:

#!/bin/bash
    
# get_rtrn
#    get return result part
# params:
#    $1 - return result string
#    $2 - number of part to be returned
# returns:
#    return result part
function get_rtrn(){
    echo `echo $1|cut --delimiter=, -f $2`
}
    
function some_func(){
    # calculate result 1
    # ...
    RES1="string1"

    # calculate result 2
    # ...
    RES2="13"

    # calculate result 3
    # ...
    RES3="value3"

    # return results
    echo "$RES1,$RES2,$RES3"
}
    
# function call
RESULT=`some_func`
echo "RESULT = $RESULT"
    
# get parts of result
RES1=`get_rtrn $RESULT 1`
RES2=`get_rtrn $RESULT 2`
RES3=`get_rtrn $RESULT 3`
    
echo "RES1 = $RES1"
echo "RES2 = $RES2"
echo "RES3 = $RES3"

Script output:

bash test.sh
RESULT = string1,13,value3
RES1 = string1
RES2 = 13
RES3 = value3