[temprature]

Removes the need to add a separate include for namespacing, ie. no pledge.h header needed.

Makes the calls shorter and easier to read. Consider:

    if (pledge("stdio rpath tmppath proc exec", NULL) == -1)
        err(1, "pledge");

vs.

    if (pledge(PLEDGE_STDIO | PLEDGE_RPATH | PLEDGE_TMPPATH | PLEDGE_PROC | PLEDGE_EXEC, NULL) == -1)
        err(1, "pledge");

Makes it easier to add a pledge interface to other languages with having to keep chasing bit flag changes, ie. there's been several new promises add since 2015 but the OpenBSD::Pledge perl module hasn't needed to change.

And really, unless you're using pledge wrong, ie. by using it outside of the startup path and/or not checking the return value, what does compile-time checking get you?