Hello Team,

I try to use lxml to perform a c14n over a document

        c14ndoc = io.StringIO()
        tree.write_c14n(c14ndoc)

I am having this issue:

    tree.write_c14n(c14ndoc)
  File "lxml.etree.pyx", line 2271, in lxml.etree._ElementTree.write_c14n (src\lxml\lxml.etree.c:60874)
  File "serializer.pxi", line 592, in lxml.etree._tofilelikeC14N (src\lxml\lxml.etree.c:124249)
  File "lxml.etree.pyx", line 316, in lxml.etree._ExceptionContext._raise_if_stored (src\lxml\lxml.etree.c:10291)
  File "serializer.pxi", line 407, in lxml.etree._FilelikeWriter.write (src\lxml\lxml.etree.c:121770)
TypeError: string argument expected, got 'bytes'

Do you have any idea ?