def replace_types( me, **newtypes):
'''uses newtypes (as valuedefs) instead.
warn: to make optional( bool) into explicit 3-state textual,
do not use optional( bool, aliaser( True:t1,False:t2,else:t3))..
needs optional( enum( t1:True,t2:False,t3:else))
'''
#assert not me.__dict__.get( '_methods_dict'), 'dont replace already used type, first inherit it'
r = dictOrder()
for w in me.methods_walk():
w = DictAttr( w.__dict__)
w.decl = w.decl.clone_new_types( types= newtypes)
r[ w.name] = w
me._methods_dict = r
