Leverage new is_type_of for iterator protocol
#1450
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Treats any object of shape `{ next: function }` as an iterator via new `is_type_of` method. This is consistent with JavaScript iteration protocol which we already respect.
Also fixes a minor issue that `is_function` was unnecessarily called twice (once explicitly and once as part of `dyn_into` which now does the same check).
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Treats any object of shape
{ next: function }as an iterator via newis_type_ofmethod. This is consistent with JavaScript iteration protocol which we already respect.Also fixes a minor issue that
is_functionwas unnecessarily called twice (once explicitly and once as part ofdyn_intowhich now does the same check).