alternate Proxy implementation

gistfile1.txt

class Proxy {
    has Mu &.FETCH;
    has Mu &.STORE;

    my constant $FETCH = method FETCH(\SELF:) {
        my $self := nqp::create(Scalar);
        nqp::bindattr($self, Scalar, '$!value', SELF);
        nqp::decont(&!FETCH($self))
    }   
    my constant $STORE = method STORE(\SELF: \value) {
        my $self := nqp::create(Scalar);
        nqp::bindattr($self, Scalar, '$!value', SELF);
        &!STORE($self, value)
    }   
    
    BEGIN {
        Proxy.HOW.set_container_spec(Proxy, nqp::hash(
          'fetch', nqp::getstaticcode(nqp::getattr($FETCH,Code,'$!do')),
          'store', nqp::getstaticcode(nqp::getattr($STORE,Code,'$!do'))
        ));
        Proxy.HOW.compose_repr(Proxy);
    }   
}