Lwt_react: no longer compare structurally the inputs of S.l[2-6]_s #893
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This avoids a failure when some inputs cannot be compared structurally (if they contain functional values, for instance). Internally, Lwt_react.S.l2 is implemented using React.S.l2 and Lwt_react.S.map_s. We were not providing an equality function to React.S.l2, so the default structural equality was used. Now, we use the function (fun _ _ -> false). So, the function parameter is applied each time any of the input change, which is exactly what we would expect if we implemented Lwt_react.S.map_s directly.
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This avoids a failure when some inputs cannot be compared (if they contain functional values, for instance).
We need to do something anyway if one of the inputs changes, so it makes sense to use physical equality here.