boundary aware transducer (#691)

aky15

2023-07-02 05ada32da80c2750cf7a831512bc55c60c39634b

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)