Wrong return type for function utf8_isASCII

Definition in utf8.php is function utf8_isASCII(string $str): string ... while Str::is_ascii($str) returns a bool

Recommendation: change utf8_isASCII function to return a bool

PHP:

function utf8_isASCII(string $str): bool
{
    return Str::is_ascii($str);
}

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