We can define the operations for N+1-tuples in terms of the ones for N-tuples, which reduces an x86-64 stdlib by about 4KB:
-rwxr-xr-x 1 jgroff staff 5172856 Dec 30 10:54 lib/swift/macosx/libswiftCore.before.dylib
-rwxr-xr-x 1 jgroff staff 5168752 Dec 30 11:59 lib/swift/macosx/libswiftCore.after.dylib
The optimizer should still be able to inline all the calls together in release builds.
Implement == and != for tuples up to arity 6 where each component type
is Equatable.
Implement <, <=, >, and >= for tuples up to arity 6 where each component
type is Comparable.
