Support lambda expressions as filter arguments. #16
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See #15
We've allowed for lambda expressions with multiple arguments. For an array input, a two-argument lambda expression is implicitly passed the item followed by the item's index in the array..
(item, index) => item.foo and index < 3.Although not used by any filters at the moment, a two-argument lambda expression would be more useful if applied to a mapping/dictionary/hash/object, as it could be passed property/value pairs, one pair for each entry in the mapping..
(key, value) => key contains 'foo' and value.bar == '42'.