get_the_terms is not zero indexed array

[leedo]

The return value of get_the_terms only says it returns an array. To me, this implies that it is an array of terms, beginning at index 0. In fact, it is closer to an associative array, using the term's ID as the key. Some documentation to this effect would be very useful. Or returning a simple array.

Expected return value:

array(1) {
  [0]=>
  object(stdClass)#1032 (10) {
    ["term_id"]=>
    string(4) "1274"
    ["name"]=>
    string(10) "Staff Blog"
    ["slug"]=>
    string(5) "blogs"
    ["term_group"]=>
    string(1) "0"
    ["term_taxonomy_id"]=>
    string(4) "1284"
    ["taxonomy"]=>
    string(13) "ars_post_type"
    ["description"]=>
    string(0) ""
    ["parent"]=>
    string(1) "0"
    ["count"]=>
    string(2) "52"
    ["object_id"]=>
    string(6) "266909"
  }
}

Actual return value:

array(1) {
  [1274]=>
  object(stdClass)#1032 (10) {
    ["term_id"]=>
    string(4) "1274"
    ["name"]=>
    string(10) "Staff Blog"
    ["slug"]=>
    string(5) "blogs"
    ["term_group"]=>
    string(1) "0"
    ["term_taxonomy_id"]=>
    string(4) "1284"
    ["taxonomy"]=>
    string(13) "ars_post_type"
    ["description"]=>
    string(0) ""
    ["parent"]=>
    string(1) "0"
    ["count"]=>
    string(2) "52"
    ["object_id"]=>
    string(6) "266909"
  }
}

Duplicate of #21608.