Pacify typechecker.
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@ -83,6 +83,7 @@ def b2a(os): # type: (bytes) -> bytes
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def b2a_or_none(os): # type: (Optional[bytes]) -> Optional[bytes]
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if os is not None:
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return b2a(os)
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return None
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# b2a() uses the minimal number of quintets sufficient to encode the binary
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# input. It just so happens that the relation is like this (everything is
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