Another, maybe simpler way to put this:
`Promise.resolve` needs to become idempotent, i.e. for all values `x`
the expression
Promise.resolve(x)
must behave exactly as the expression
Promise.resolve(Promise.resolve(x));
where it accesses `x.then` only exactly once. The current spec would
test for it twice, which even gives way to fulfilling promises with
thenables - if only the `then` method is attached to your object after
you have resolved your promise with it. Which could cause some quite
unexpected results.
Bergi
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