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The same should happen for `Int32x4` and `Float64x2`, but this is a start. The existing class was basically uncommented and you had to guess or explore to find out what, fx, the returned values for the relational operators means. I've tried to discover and document the current behavior, but I had to fall back on "it's implementation specific" in some places where platforms behave differently. (For example it seems VM on Mac treats `.reciprocalSqrt()` as doing `.sqrt().reciprocal()` where the other platforms do `.reciprocal().sqrt()`, which makes a difference for exactly one value.) CoreLibraryReviewExempt: Doc and parameter name changes only. Tested: Added more tests to float32x4_test.dart. Change-Id: I3f8804f842d8a5d95e1d378a7edb9438a2f3ed2b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/415000 Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>