* field depends on the 'allocated' field
				 * above. */
} ByteArray;

#define BYTEARRAY_MAX_LEN \
    (TCL_SIZE_MAX - (Tcl_Size)offsetof(ByteArray, bytes))
#define BYTEARRAY_SIZE(len) \
    ( (len < 0 || BYTEARRAY_MAX_LEN < (len))				\
	? (Tcl_Panic("negative length specified or max size of a Tcl value exceeded"), 0) \
	: (offsetof(ByteArray, bytes) + (len)) )
#define GET_BYTEARRAY(irPtr) \
    ((ByteArray *) (irPtr)->twoPtrValue.ptr1)
#define SET_BYTEARRAY(irPtr, baPtr) \
    (irPtr)->twoPtrValue.ptr1 = (baPtr)