Clear (o).w first for MRB_WORD_BOXING; ref
@@ -100,8 +100,8 @@ mrb_type(mrb_value o)
case MRB_TT_FALSE: (o).w = (v) ? MRB_Qfalse : MRB_Qnil; break;\
case MRB_TT_TRUE: (o).w = MRB_Qtrue; break;\
case MRB_TT_UNDEF: (o).w = MRB_Qundef; break;\
- case MRB_TT_FIXNUM: (o).value.i_flag = MRB_FIXNUM_FLAG; (o).attr = (v); break;\
- case MRB_TT_SYMBOL: (o).value.sym_flag = MRB_SYMBOL_FLAG; (o).attr = (v); break;\
+ case MRB_TT_FIXNUM: (o).w = 0;(o).value.i_flag = MRB_FIXNUM_FLAG; (o).attr = (v); break;\
+ case MRB_TT_SYMBOL: (o).w = 0;(o).value.sym_flag = MRB_SYMBOL_FLAG; (o).attr = (v); break;\
default: (o).w = 0; (o).attr = (v); if ((o).value.bp) (o).value.bp->tt = ttt; break;\
}\
} while (0)
