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The new Field.MultiCheckboxField.htInputRender should be:

def htInputRender(self, out, selections, default, options,
nameMap=identity):
id = 0
for key, value in selections:
id = id + 1
out.write(html.input.checkbox(
name=nameMap(self.name()),
id="%s_%02i" % (nameMap(self.name()), id),
value=self.encode(key),
checked=self.selected(key, default) and
"checked" or Exclude))
out.write(html.label(
" " + htmlEncode(value),
for_="%s_%02i" % (nameMap(self.name()), id)))
out.write(html.br())