Confusing

This is a very confusing programming language. The commands don't do what you think they do.

Instruction	What it ACTUALLY does (not what you think it does)
12'34	The number literals do NOT make sense. 0 actually means 9, 1 means 8, and so on. And the decimal point isn't even a decimal point. So the above example pushes 87.65.
"..."	Pushes the ascii codes of everything inside, WITH BITWISE NOT APPLIED. So "a" actually pushes "\x9E".
-	Add top two elements.
+	Subtract.
/	Multiply.
*	Divide.
^	Modulo.
%	Power.
)	Start codeblock.
(	End codeblock.
W	If top of stack is zero, then [next codeblock].
I	While top of stack is zero, do [next codeblock].
n	Input character into stack.
C	Output top of stack as number.
c	Input number into stack.
N	Output top of stack as character. (MODULO 255 FIRST!)
$	Duplicate top of stack.
;	Pop top of stack.
\	Dup the second stack item (over).
|	Swap top two stack items.
X, Y	Pop from main stack and push to the corresponding storage stack. (Finally something that makes sense.)
x, y	Pop from storage stack and push to main stack (WARNING: x actually pops from Y and vice versa)
!	Negate top stack item.
_	Logical not stop stack item.
<	Pop a and b, push 1 if a>b, and 0 otherwise.
>	<, but with less than.
.	Pushes ascii code of the next character (remember the decimal point?)
P	Get. Pop x, pushes ascii code of command x. Empty cells are equal to -1, not 0, so be VERY careful.
G	Put. Pop x and y, replace xth command with y.
E	If followed by a codeblock, defines a function for the next character. Else, calls that function.
F	End the program.
L	Clear the stack.
X	Push stack length.
U	Move bottom stack value up.
D	Move top stack value down.