>	enum {
>		EMPTY = 0,
>		CHILD,
>		INT32,		/* same as `integer' in sysctl(3) */
>		INT64,
>		STRING = 10,
>		OPAQUE,
>		READONLY = 0x80000000,
>	} sysctltype_t;

READONLY really oughta be a flag, not a type.  after all, can't you
have read only strings, ints (both 32 and 64), and "opaque" types (for
tables, right?)?  hmm...wouldn't opaque be read only be default?

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