TYPO3 Core

The install tool "all configuration" section has the neat possibility to
display even custom options configured in localconf.php
For example add:
$TYPO3_CONF_VARS['EXTCONF']['dbal'] = 'test';

and you'll get a text input field.

If I now add additionally to that line
// Modified or inserted by TYPO3 Install Tool.
$TYPO3_CONF_VARS['EXTCONF']['dbal']['handlerCfg'] = array(
'_DEFAULT' => array(
'type' => 'adodb',
'config' => array(
'driver' => 'oci8',
'driverOptions' => array(
'connectSID' => TRUE,
)
)
)
);

there are two problems:
1) the array is not editable by the all configuration section (this
could be an extra bug/feature)
2) adding the array causes the install tool to change the first line to:
$TYPO3_CONF_VARS['EXTCONF']['dbal'] = 'Aest'; (changes the "t" to an
"A") in the install tool and saves the wrong value on enter - which is a
real bug I think.

Reported by Susanne for the related feature.
(issue imported from #M16379)