Possible bug in input validation for start_stream_transcription

[sm-andrew-w]

When calling start_stream_transcription(), if I pass in a value of 1 for number_of_channels, I get this error message:

  stream = await client.start_stream_transcription(
File "[...]\.awst_env\lib\site-packages\amazon_transcribe\client.py", line 187, in start_stream_transcription
    raise self._response_parser.parse_exception(resolved_response, body_bytes)
amazon_transcribe.exceptions.BadRequestException: 1 validation error detected: Value '1' at 'numberOfChannels' failed to satisfy constraint: Member must have value greater than or equal to 2

But if I don't pass any value, the transcription appears to work correctly with my 1-channel audio. The docs say 1-channel is supported, and the quick-start example uses 1-channel. So I'm assuming 1-channel is valid input, and maybe this is an issue with the validation logic? I can work around it by passing None if my channel count is 1, but this seems like an unnecessary hassle.

This is on Windows with Python 3.9.