number, <precision>
Return the string representation of a number
Convert a numeric argument into its textual equivalent in a string.
The optional precision argument specifies the maximum number of
significant figures to write - default = 4. For example:

0> type "The result is: "//strnum(12.34567)//" OK?"
		"The result is: 12.35 OK?" 

0> type "The result is: "//strnum(12.34567,2)//" OK?"
		"The result is: 12 OK?"

