System Tunables refuses non-alphanumeric characters
Create system tunable 'kern.timecounter.hardware' with value 'TSC-low' through the web GUI of pfSense 2.3.1_1.
Try to save it, and an error is displayed. The value is not saved. This is the error message:
The following input errors were detected:
The value may contain alphanumeric characters only.
Note that 'TSC-low' is a valid value for this tunable, and the GUI should allow it like it did in pre 2.3 versions.