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This commit changes how JavaScript values are referenced by Go code. After this change, a JavaScript value is always represented by the same ref, even if passed multiple times from JavaScript to Go. This allows Go's == operator to work as expected on js.Value (strict equality). Additionally, the performance of some operations of the syscall/js package got improved by saving additional roundtrips to JavaScript code. Fixes #25802. Change-Id: Ide6ffe66c6aa1caf5327a2d3ddbe48fe7c180461 Reviewed-on: https://go-review.googlesource.com/120561 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>