TypeError raised from ord() call in yaml.emit

[gabe-sherman]

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The below code results in a TypeError: ord() expected string of length 1, but int found when yaml.emit is called. This occurs in the function prepare_tag_prefix at line 575 in emitter.py.

Minimized Reproducer:

import io
import yaml

text = io.BytesIO( b"%TAG ! tag:%002:\n---")
events = list(yaml.parse(text))
output = yaml.emit(events)

Version Information:

7.0.0.dev0 also occurs in the current release: 6.0.2

Exception Trace:

  File "/rep.py", line 6, in <module>
    output = yaml.emit(events)
  File "lib/python3.9/site-packages/yaml/__init__.py", line 172, in emit
    dumper.emit(event)
  File "lib/python3.9/site-packages/yaml/emitter.py", line 115, in emit
    self.state()
  File "lib/python3.9/site-packages/yaml/emitter.py", line 176, in expect_first_document_start
    return self.expect_document_start(first=True)
  File "lib/python3.9/site-packages/yaml/emitter.py", line 193, in expect_document_start
    prefix_text = self.prepare_tag_prefix(prefix)
  File "lib/python3.9/site-packages/yaml/emitter.py", line 575, in prepare_tag_prefix
    chunks.append('%%%02X' % ord(ch))
TypeError: ord() expected string of length 1, but int found