0.03 - 06 Sep 2005
    Handle the case of the mapstart op, which hasn't a pp function
    corresponding to its type

0.02 - 06 Sep 2005
    Inline some small hot ops, taking code from current bleadperl :
    null, stub, scalar, pushmark, const, gv, pushre, stringify, and, or,
    cond_expr, nextstate, unstack, setstate

0.01 - 02 Sep 2005
    First version.