An array containing the valid weekday names, defined as:
WEEKDAYS[0] is "Sunday"
WEEKDAYS[1] is "Monday"
WEEKDAYS[2] is "Tuesday"
WEEKDAYS[3] is "Wednesday"
WEEKDAYS[4] is "Thursday"
WEEKDAYS[5] is "Friday"
WEEKDAYS[6] is "Saturday"
Reason indicating that the StatelessContextSerializer is unable to write
the given object in a byte array (details are in the message
and/or the nested cause exception).
