jallum / iodata / 0bb10535e8bcd0717704bccf3f6a80a74380bd20-PR-2

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Pull #2

github

Enforce exact-count file reads, normalize text-mode reads, validate split/2

Review fixes for the file implementations:

- to_binary/3 accepted any {:ok, data} from pread, so a range overlapping
  EOF returned a short read tagged ok — silent truncation. It now requires
  exactly `count` bytes and returns {:error, :insufficient_data} otherwise;
  reads entirely past EOF return :insufficient_data instead of :eof, matching
  the other implementations.
- Files opened without :binary made pread return charlists, breaking the
  to_binary contract and starts_with?. Reads are normalized with
  IO.iodata_to_binary/1, the identity for binary-mode files.
- split/2 on a file returned {:ok, slices} for any offset. It now checks the
  offset against the file size (one read_file_info) and returns
  {:error, :insufficient_data} / raises from split!/2. slice/2,3 stays lazy
  by design; its laziness is documented in IOData.File.

Claude-Session: https://claude.ai/code/session_01GqkKDgEdSuWfZRL2KnYqAs

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