Returns the value of the evaluated <math expression>. The syntax is Python syntax; the type of arithmetic is floating point. Floating point arithmetic is used in order to prevent a user from being able to crash to the bot with something like '10**10**10**10'. One consequence is that large values such as '10**24' might not be exact.
This is the same as the calc command except that it allows integer math, and can thus cause the bot to suck up CPU. Hence it requires the 'trusted' capability to use.
With no arguments, returns a list of measurement types, which can be passed as arguments. When called with a type as an argument, returns the units of that type.