Method equals

chapter11/src/main/java/com/seaofnodes/simple/type/Type.java:112–118

( Object o )

    int hash() { return _type; }

    @Override
    public final boolean equals( Object o ) {
        if( o==this ) return true;
        if( !(o instanceof Type t)) return false;
        if( _type != t._type ) return false;
        return eq(t);
    }
    // Overridden in subclasses; subclass can assume "this!=t" and java classes are same
    boolean eq(Type t) { return true; }