IntLatLngSnapFunction.SnapPoint test failure: +/-180 longitude

[jmr]

[ RUN      ] IntLatLngSnapFunction.SnapPoint
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
E0000 00:00:1777950374.802920  127641 s2latlng.cc:69] Invalid S2LatLng in S2LatLng::ToPoint: [57.1240000, -180.0000000]
E0000 00:00:1777950374.803138  127641 s2latlng.cc:69] Invalid S2LatLng in S2LatLng::ToPoint: [57.1240000, 180.0000000]
/Users/runner/work/s2geometry/s2geometry/src/s2/s2builderutil_snap_functions_test.cc:132: Failure
Expected equality of these values:
  p5
    Which is: [-0.542823, 1.74585e-16, 0.839847]
  IntLatLngSnapFunction(5).SnapPoint(p5)
    Which is: [-0.542823, -1.74585e-16, 0.839847]

[  FAILED  ] IntLatLngSnapFunction.SnapPoint (15 ms)

I see + 1 can put it out of range, but we're having problems with p5 before that.

s2geometry/src/s2/s2builderutil_snap_functions_test.cc

Lines 138 to 140 in baf4af9

	// Make sure that we're not snapping using some lower exponent.
	S2Point p7not6 = S2LatLng::FromE7(10 * ll.lat().e6() + 1,
	10 * ll.lng().e6() + 1).ToPoint();