If you want to pass a complex value, your best path is probably to jsonify it. Something like
$.post( MyAjax.ajaxurl, {
action: 'my_action',
someValue: JSON.stringify({
one: 'Some Value One',
two: 'Some Value Two',
three: 'Some Value Three',
four: 'Some Value Four',
})
} );
and then on the server side you decode the value with
$someValue = json_decode($_POST['someValue']);
At this point $someValue
should be the array you wanted to pass.
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