gh-153569: Replace tokenizer input readers - #156472
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August 27, 2026 14:36
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This gets rid of the four separate tokenizer input implementations and replaces them with one reader and decoder pipeline. Files, strings, readline callbacks, and interactive input now share encoding detection, incremental decoding, newline handling, and cleanup, so the duplicated reader state and helpers go away. Complete UTF-8 callback lines skip incremental codec setup, while split and stateful input keeps the decoder state it needs. Interactive input keeps the source it needs without making the other readers retain a second copy.
This is the next part of #153569.