Can I check that array does NOT contain fields other than those in pattern?

[lezhnev74]

If I have an array:

$array = [
    "key1" => true,
    "key2" => false
];

then can I check that array has only key1 and nothing else?

$pattern = [
    "key1" => ":bool"
];
matchmaker\matches($array, $pattern)