parseLenient *only* uses eval(), not only as a fallback. This is because
JSON is stricter than JavaScript's object literal notatio: in JSON, object
property names must be quoted; JS can include comments, etc. JSON.parse
cannot parse those JS literal objects that do not quote property names
and/or include comments, for instance.
And of course, parseLenient could execute code, including both "safe" things
such as new Date(sometimestamp) and "unsafe" ones such as alert("hello") or
much, much worse!
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