public char peek(int lookAhead) {
		debugCheck(lookAhead);
		return iter.peek(lookAhead);
	}
Peeks at the character current index + lookAhead. Returns DONE if the
computed position is out of range.

@param lookAhead
           number of characters to look ahead
@return the character at index+lookAhead
Ghidra/Features/MicrosoftDmang/src/main/java/mdemangler/MDMang.java