Optimize std.contract.Equal
using %record/split_pair%
#1988
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The std.contract.Equal contract needs to be lazy, which means that it re-implements equality logic in pure Nickel code, which has proven to be very slow (#1930).
This commit replaces the field difference operation, implemented using a left fold, by the new builtin operator
%record/split_pair%
, which shows a performance improvement of around 300% for the example of #1930.