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There is a newer version: 1.3.3

"A type capable of representing the values [[true]] and
 [[false]] of Boolean logic."
by ("Gavin")
tagged("Basic types")
shared native abstract class Boolean
        of true | false {
    
    "The `Boolean` value of the given string representation 
     of a boolean value, or `null` if the string does not 
     represent a boolean value.
     
     Recognized string representations are the strings
     `\"true\"` and `\"false\"`."
    tagged("Basic types")
    since("1.3.1")
    shared static Boolean|ParseException parse(String string)
            => package.parseBoolean(string) 
            else ParseException("illegal format for Boolean");
    
    shared new () {}
}

"A value representing truth in Boolean logic."
tagged("Basic types")
shared native object true
        extends Boolean() {
    string => "true";
    hash => 1231;
}

"A value representing falsity in Boolean logic."
tagged("Basic types")
shared native object false
        extends Boolean() {
    string => "false";
    hash => 1237;
}