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Replace | typing usage with Optional and Union
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@@ -23,6 +23,8 @@ import atexit
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import os
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import logging
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from typing import Optional
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from .common import Transport, StreamPacketSource, StreamPacketSink
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# -----------------------------------------------------------------------------
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@@ -32,7 +34,7 @@ logger = logging.getLogger(__name__)
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# -----------------------------------------------------------------------------
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async def open_pty_transport(spec: str | None) -> Transport:
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async def open_pty_transport(spec: Optional[str]) -> Transport:
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'''
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Open a PTY transport.
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The parameter string may be empty, or a path name where a symbolic link
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