Should I2C Master ACK after last byte in read sequence?

I've never dived into the I2C protocol too much. However, I started doing a bit of a dive recently and noticed that I have some code in PropWare which is sending a NACK instead of an ACK after the last byte that a master reads. This seems crazy to me. Why would the master ever be coded to explicitly send a NACK? Here's an example:


And this read sequence returns 0x01 to the calling function, so the master is indeed reading the value from the slave correctly.
PropWare: C++ HAL (Hardware Abstraction Layer) for PropGCC; Robust build system using CMake; Integrated Simple Library, libpropeller, and libPropelleruino (Arduino port); Instructions for Eclipse and JetBrain's CLion; Example projects; Doxygen documentation
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