drush_get_context and _drush_sql_get_db_spec return different stuff. Should they?

A small test function to show my thoughts:

function densite_test($site){
$db_spec = array();
$db_spec = drush_get_context('DRUSH_DB_CREDENTIALS');
print_r($db_spec);
$db_spec = _drush_sql_get_db_spec();
print_r($db_spec);
}

this will return:

Array
(
[driver] => mysqli
[user] => dennis
[host] => localhost
[port] =>
[pass] => password
[name] => dennisdesktop
)
Array
(
[driver] => mysql
[username] => dennis
[password] => password
[port] =>
[host] => localhost
[database] => dennisdesktop
)

1) Should these functions not at least return the same driver info. The site is using mysqli.
2) And should'nt the two functions return the same stuff, thinking of the keys in the array.
3) And should'nt these functions actually be just one function.

Or maybe I'm not enough into the drush and drupal project yet to understand this.

Note: this applies to both the 'issue' version and the 'development drush-All-Versions-HEAD' version.

- Greetings from Dennis .)