MP6604A PGND resistors

The typical application circuit of the MP6604A datasheet shows a 50 mOhm series resistor on each power-ground pin. The schematic of the corresponding eval board has 100 mOhm resistors in the same place. The datasheet does not describe a requirement or even a recommendation for these resistors, and there is no mention of them anywhere else.

Please clarify the role and purpose of these resistors.