Add empty() growable-buffer initializer for Python encoders#191
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Add an empty() classmethod to the Python runtime encoders (UPEREncoder, ACNEncoder via the Encoder base, and XEREncoder) for creating an encoder when the output size is not known in advance, without a size estimate. BitStream gains an opt-in growable flag: write operations that would exceed the buffer grow it (amortised doubling) instead of raising. The flag defaults to False, so of_size()/from_buffer() buffers and decoders keep their bounded semantics. This brings the runtime in line with the MBEP TN-3 user manual, which already documents empty() as the recommended encoder initializer.
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Add an empty() classmethod to the Python runtime encoders (UPEREncoder, ACNEncoder via the Encoder base, and XEREncoder) for creating an encoder when the output size is not known in advance, without a size estimate.
BitStream gains an opt-in growable flag: write operations that would exceed the buffer grow it (amortised doubling) instead of raising. The flag defaults to False, so of_size()/from_buffer() buffers and decoders keep their bounded semantics. This brings the runtime in line with the MBEP TN-3 user manual, which already documents empty() as the recommended encoder initializer.