Citrix Systems 9.2 manual Result of applying the Bitneg operator is -11 a binary

Chapter 3 Configuring Advanced Expressions: Getting Started 53

Arithmetic Operations for Compound Advanced Expressions

Operator	Description
number.BITNEG	Returns a number after applying a bitwise logical negation of the
	number. The following example assumes that numeric.expression
	returns 12 (binary 1100):
	numeric.expression.bitneg()
	The result of applying the BITNEG operator is -11 (a binary
	1110011, 32 bits total with all ones to the left).
	The following is another example of an expression that uses a
	BITNEG. Assume that the expression prior to the BITNEG returns a
	value of 8:
	http.req.header(\"test\").contains_index(\"pat1\"
	).bitneg
	The result of this expression is -9.
	A tilde (~) performs a similar function to BITNEG, but takes another
	expression as an argument rather than an integer.
	Note that all returned values of less than 32 bits before applying the
	operator implicitly have zeros to the left to make them 32 bits wide.
number.BITOR	Returns a number after applying a bitwise OR to the integer
(integer)	argument and the current number value. If either value in the bitwise
	comparison is a 1, the returned value is a 1. The following example
	assumes that numeric.expression returns 12 (binary 1100):
	numeric.expression.bitor(10)
	The binary value of 10 is 1010, and the result of applying the BITOR
	operator to the entire expression is 14 (binary 1110).
	The following is another example of an expression that uses a
	BITOR. Assume that the expression prior to the BITOR returns a
	value of 8:
	http.req.header(\"test\").contains_index(\"pat1\"
	).bitor(8)
	The result of this expression is 8.
	A bar () performs a similar function to BITOR, but takes another
	expression as an argument rather than an integer.
	Note that all returned values of less than 32 bits before applying the
	operator implicitly have zeros to the left to make them 32 bits wide.