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gh-141311: Avoid assertion in BytesIO readinto#141333
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Account for when self->pos is equal to PY_SSIZE_T_MAX. The length ofread was correctly set to zero but the asserts assumedself->pos couldn't reach PY_SSIZE_T_MAX. Return early to avoid edgecases.
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Account for when self->pos is equal to PY_SSIZE_T_MAX. The length of read was correctly set to zero but the asserts assumed self->pos couldn't reach PY_SSIZE_T_MAX. Return early to avoid edge cases.
_io_BytesIO_readinto_impl: Assertion 'self->pos + len < PY_SSIZE_T_MAX' failed.#141311