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This fixes two major problems with the use of tie for filehandles:
* no way to do fcntl, stat, etc. calls directly on the tied handle,
forcing callers to use the `tied' perlop to access the underlying
IO::Handle
* needing separate classes to handle blocking and non-blocking I/O
As a result, Git->cleanup_if_unlinked, InputPipe->consume,
and Qspawn->_yield_start have fewer bizzare bits and we
can call `$io->blocking(0)' directly instead of
`(tied *$io)->{fh}->blocking(0)'
Having a PublicInbox::IO class will also allow us to support
custom read buffering which allows inspecting the current state.
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