circuits_i2c.write_read

You're seeing just the function write_read, go back to circuits_i2c module for more information.
Link to this function

write_read(ref, address, write_data, read_count)

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See Circuits.I2C.write_read/4.

Link to this function

write_read(ref, address, write_data, read_count, opts)

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See Circuits.I2C.write_read/5.