Keys and Values are improperly constrained to type String

[jereynolds]

The following function implicitly constrains the data type of cache keys and values to String. Memcache and the binary SASL protocol support both keys and values of arbitrary type since they are binary formats. The client library should not assume that these items are strings.

protected function _build_request($data)
{
$valuelength = $extralength = $keylength = 0;
if (array_key_exists('extra', $data)) {
$extralength = strlen($data['extra']);
}
if (array_key_exists('key', $data)) {
$keylength = strlen($data['key']);
}
if (array_key_exists('value', $data)) {
$valuelength = strlen($data['value']);
}
...
...
}