Search metadata checkbox allow multiple

good day,


i am just wondering if it's possible to search a list of a style CHECKBOX.



how is the comparison made?



from what i've seen in the URL query, the checkbox list is an array. only the "checked" fields are appended to the URL, for example for box number 7 what appended is:



queries_NAME_query%5B7%5D=VALUE



(which is: queries_NAME_query[7]=VALUE)



so i assume only array fields that are "checked" are being compared and it doesn't matter what are the values of other fields on the back-end.



but i cannot make it working.



if i switch the metadata field (LIST, CHECKBOX) not to allow multiple selections, the CHECKBOXES are automatically changed to RADIO buttons on the front-end, and the comparison works fine.



but if i have multiple selections allowed (=checkboxes) and even if i have just one field checked on the back-end and front-end, the comparison doesn't work properly.



any ideas?



thank you.