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> The falling back to read() was implemented in issue12591. What methods still require read1()?
I read the Python implementation of TextIOWrapper in _pyio:
* seek() calls buffer.read() "if chars_to_skip:"... not sure that it can happen if buffer is a FileIO?
* read(None) and read(-1) to read "everything" (until EOF): buffer.read()
It seems like read(None) also calls buffer.read() in the C implementation, _io_TextIOWrapper_read_impl():
 /* Read everything */
 PyObject *bytes = _PyObject_CallMethodId(self->buffer, &PyId_read, NULL);
 PyObject *decoded;
 if (bytes == NULL)
 goto fail;
and in _io_TextIOWrapper_seek_impl():
 /* Just like _read_chunk, feed the decoder and save a snapshot. */
 PyObject *input_chunk = _PyObject_CallMethodId(
 self->buffer, &PyId_read, "i", cookie.bytes_to_feed);